1145256Sjkoshy/*- 2183266Sjkoshy * Copyright (c) 2003-2008 Joseph Koshy 3174395Sjkoshy * Copyright (c) 2007 The FreeBSD Foundation 4145256Sjkoshy * All rights reserved. 5145256Sjkoshy * 6174395Sjkoshy * Portions of this software were developed by A. Joseph Koshy under 7174395Sjkoshy * sponsorship from the FreeBSD Foundation and Google, Inc. 8174395Sjkoshy * 9145256Sjkoshy * Redistribution and use in source and binary forms, with or without 10145256Sjkoshy * modification, are permitted provided that the following conditions 11145256Sjkoshy * are met: 12145256Sjkoshy * 1. Redistributions of source code must retain the above copyright 13145256Sjkoshy * notice, this list of conditions and the following disclaimer. 14145256Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 15145256Sjkoshy * notice, this list of conditions and the following disclaimer in the 16145256Sjkoshy * documentation and/or other materials provided with the distribution. 17145256Sjkoshy * 18145256Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19145256Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20145256Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21145256Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22145256Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23145256Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24145256Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25145256Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26145256Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27145256Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28145256Sjkoshy * SUCH DAMAGE. 29145256Sjkoshy * 30145256Sjkoshy */ 31145256Sjkoshy 32145256Sjkoshy#include <sys/cdefs.h> 33145256Sjkoshy__FBSDID("$FreeBSD$"); 34145256Sjkoshy 35145256Sjkoshy#include <sys/param.h> 36145256Sjkoshy#include <sys/eventhandler.h> 37145256Sjkoshy#include <sys/jail.h> 38145256Sjkoshy#include <sys/kernel.h> 39147191Sjkoshy#include <sys/kthread.h> 40145256Sjkoshy#include <sys/limits.h> 41145256Sjkoshy#include <sys/lock.h> 42145256Sjkoshy#include <sys/malloc.h> 43145256Sjkoshy#include <sys/module.h> 44201151Sjkoshy#include <sys/mount.h> 45145256Sjkoshy#include <sys/mutex.h> 46145256Sjkoshy#include <sys/pmc.h> 47145256Sjkoshy#include <sys/pmckern.h> 48147191Sjkoshy#include <sys/pmclog.h> 49164033Srwatson#include <sys/priv.h> 50145256Sjkoshy#include <sys/proc.h> 51145256Sjkoshy#include <sys/queue.h> 52147191Sjkoshy#include <sys/resourcevar.h> 53248084Sattilio#include <sys/rwlock.h> 54145256Sjkoshy#include <sys/sched.h> 55145256Sjkoshy#include <sys/signalvar.h> 56145256Sjkoshy#include <sys/smp.h> 57145256Sjkoshy#include <sys/sx.h> 58145256Sjkoshy#include <sys/sysctl.h> 59145256Sjkoshy#include <sys/sysent.h> 60145256Sjkoshy#include <sys/systm.h> 61147191Sjkoshy#include <sys/vnode.h> 62145256Sjkoshy 63157144Sjkoshy#include <sys/linker.h> /* needs to be after <sys/malloc.h> */ 64157144Sjkoshy 65147191Sjkoshy#include <machine/atomic.h> 66145256Sjkoshy#include <machine/md_var.h> 67145256Sjkoshy 68201021Sjkoshy#include <vm/vm.h> 69201021Sjkoshy#include <vm/vm_extern.h> 70201021Sjkoshy#include <vm/pmap.h> 71201021Sjkoshy#include <vm/vm_map.h> 72201021Sjkoshy#include <vm/vm_object.h> 73201021Sjkoshy 74233628Sfabient#include "hwpmc_soft.h" 75233628Sfabient 76145256Sjkoshy/* 77145256Sjkoshy * Types 78145256Sjkoshy */ 79145256Sjkoshy 80145256Sjkoshyenum pmc_flags { 81145256Sjkoshy PMC_FLAG_NONE = 0x00, /* do nothing */ 82145256Sjkoshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 83145256Sjkoshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 84145256Sjkoshy}; 85145256Sjkoshy 86145256Sjkoshy/* 87145256Sjkoshy * The offset in sysent where the syscall is allocated. 88145256Sjkoshy */ 89145256Sjkoshy 90145256Sjkoshystatic int pmc_syscall_num = NO_SYSCALL; 91145256Sjkoshystruct pmc_cpu **pmc_pcpu; /* per-cpu state */ 92145256Sjkoshypmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 93145256Sjkoshy 94145256Sjkoshy#define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 95145256Sjkoshy 96145256Sjkoshystruct mtx_pool *pmc_mtxpool; 97145256Sjkoshystatic int *pmc_pmcdisp; /* PMC row dispositions */ 98145256Sjkoshy 99145256Sjkoshy#define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 100145256Sjkoshy#define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 101145256Sjkoshy#define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 102145256Sjkoshy 103145256Sjkoshy#define PMC_MARK_ROW_FREE(R) do { \ 104145256Sjkoshy pmc_pmcdisp[(R)] = 0; \ 105145256Sjkoshy} while (0) 106145256Sjkoshy 107145256Sjkoshy#define PMC_MARK_ROW_STANDALONE(R) do { \ 108145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 109145256Sjkoshy __LINE__)); \ 110145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 111183266Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= (-pmc_cpu_max_active()), \ 112183266Sjkoshy ("[pmc,%d] row disposition error", __LINE__)); \ 113145256Sjkoshy} while (0) 114145256Sjkoshy 115145256Sjkoshy#define PMC_UNMARK_ROW_STANDALONE(R) do { \ 116145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 117145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 118145256Sjkoshy __LINE__)); \ 119145256Sjkoshy} while (0) 120145256Sjkoshy 121145256Sjkoshy#define PMC_MARK_ROW_THREAD(R) do { \ 122145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 123145256Sjkoshy __LINE__)); \ 124145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 125145256Sjkoshy} while (0) 126145256Sjkoshy 127145256Sjkoshy#define PMC_UNMARK_ROW_THREAD(R) do { \ 128145256Sjkoshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 129145256Sjkoshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 130145256Sjkoshy __LINE__)); \ 131145256Sjkoshy} while (0) 132145256Sjkoshy 133145256Sjkoshy 134145256Sjkoshy/* various event handlers */ 135254813Smarkjstatic eventhandler_tag pmc_exit_tag, pmc_fork_tag, pmc_kld_load_tag, 136254813Smarkj pmc_kld_unload_tag; 137145256Sjkoshy 138145256Sjkoshy/* Module statistics */ 139145256Sjkoshystruct pmc_op_getdriverstats pmc_stats; 140145256Sjkoshy 141145256Sjkoshy/* Machine/processor dependent operations */ 142185363Sjkoshystatic struct pmc_mdep *md; 143145256Sjkoshy 144145256Sjkoshy/* 145145256Sjkoshy * Hash tables mapping owner processes and target threads to PMCs. 146145256Sjkoshy */ 147145256Sjkoshy 148145256Sjkoshystruct mtx pmc_processhash_mtx; /* spin mutex */ 149145256Sjkoshystatic u_long pmc_processhashmask; 150145256Sjkoshystatic LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 151145256Sjkoshy 152145256Sjkoshy/* 153145256Sjkoshy * Hash table of PMC owner descriptors. This table is protected by 154145256Sjkoshy * the shared PMC "sx" lock. 155145256Sjkoshy */ 156145256Sjkoshy 157145256Sjkoshystatic u_long pmc_ownerhashmask; 158145256Sjkoshystatic LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 159145256Sjkoshy 160145256Sjkoshy/* 161147191Sjkoshy * List of PMC owners with system-wide sampling PMCs. 162147191Sjkoshy */ 163147191Sjkoshy 164147191Sjkoshystatic LIST_HEAD(, pmc_owner) pmc_ss_owners; 165147191Sjkoshy 166147191Sjkoshy 167147191Sjkoshy/* 168184802Sjkoshy * A map of row indices to classdep structures. 169184802Sjkoshy */ 170184802Sjkoshystatic struct pmc_classdep **pmc_rowindex_to_classdep; 171184802Sjkoshy 172184802Sjkoshy/* 173145256Sjkoshy * Prototypes 174145256Sjkoshy */ 175145256Sjkoshy 176153110Sru#ifdef DEBUG 177145256Sjkoshystatic int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 178145256Sjkoshystatic int pmc_debugflags_parse(char *newstr, char *fence); 179145256Sjkoshy#endif 180145256Sjkoshy 181145256Sjkoshystatic int load(struct module *module, int cmd, void *arg); 182147191Sjkoshystatic int pmc_attach_process(struct proc *p, struct pmc *pm); 183145256Sjkoshystatic struct pmc *pmc_allocate_pmc_descriptor(void); 184147191Sjkoshystatic struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 185147191Sjkoshystatic int pmc_attach_one_process(struct proc *p, struct pmc *pm); 186147191Sjkoshystatic int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 187147191Sjkoshy int cpu); 188147191Sjkoshystatic int pmc_can_attach(struct pmc *pm, struct proc *p); 189233628Sfabientstatic void pmc_capture_user_callchain(int cpu, int soft, struct trapframe *tf); 190147191Sjkoshystatic void pmc_cleanup(void); 191147191Sjkoshystatic int pmc_detach_process(struct proc *p, struct pmc *pm); 192147191Sjkoshystatic int pmc_detach_one_process(struct proc *p, struct pmc *pm, 193147191Sjkoshy int flags); 194147191Sjkoshystatic void pmc_destroy_owner_descriptor(struct pmc_owner *po); 195147191Sjkoshystatic struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 196147191Sjkoshystatic int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 197145256Sjkoshystatic struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 198145256Sjkoshy pmc_id_t pmc); 199145256Sjkoshystatic struct pmc_process *pmc_find_process_descriptor(struct proc *p, 200145256Sjkoshy uint32_t mode); 201145774Sjkoshystatic void pmc_force_context_switch(void); 202145256Sjkoshystatic void pmc_link_target_process(struct pmc *pm, 203145256Sjkoshy struct pmc_process *pp); 204174395Sjkoshystatic void pmc_log_all_process_mappings(struct pmc_owner *po); 205174395Sjkoshystatic void pmc_log_kernel_mappings(struct pmc *pm); 206174395Sjkoshystatic void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p); 207147191Sjkoshystatic void pmc_maybe_remove_owner(struct pmc_owner *po); 208147191Sjkoshystatic void pmc_process_csw_in(struct thread *td); 209147191Sjkoshystatic void pmc_process_csw_out(struct thread *td); 210145256Sjkoshystatic void pmc_process_exit(void *arg, struct proc *p); 211145256Sjkoshystatic void pmc_process_fork(void *arg, struct proc *p1, 212145256Sjkoshy struct proc *p2, int n); 213233628Sfabientstatic void pmc_process_samples(int cpu, int soft); 214147191Sjkoshystatic void pmc_release_pmc_descriptor(struct pmc *pmc); 215147191Sjkoshystatic void pmc_remove_owner(struct pmc_owner *po); 216147191Sjkoshystatic void pmc_remove_process_descriptor(struct pmc_process *pp); 217147191Sjkoshystatic void pmc_restore_cpu_binding(struct pmc_binding *pb); 218147191Sjkoshystatic void pmc_save_cpu_binding(struct pmc_binding *pb); 219147191Sjkoshystatic void pmc_select_cpu(int cpu); 220145256Sjkoshystatic int pmc_start(struct pmc *pm); 221145256Sjkoshystatic int pmc_stop(struct pmc *pm); 222147191Sjkoshystatic int pmc_syscall_handler(struct thread *td, void *syscall_args); 223147191Sjkoshystatic void pmc_unlink_target_process(struct pmc *pmc, 224147191Sjkoshy struct pmc_process *pp); 225233628Sfabientstatic int generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp); 226233628Sfabientstatic int generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp); 227233628Sfabientstatic struct pmc_mdep *pmc_generic_cpu_initialize(void); 228233628Sfabientstatic void pmc_generic_cpu_finalize(struct pmc_mdep *md); 229145256Sjkoshy 230145256Sjkoshy/* 231145256Sjkoshy * Kernel tunables and sysctl(8) interface. 232145256Sjkoshy */ 233145256Sjkoshy 234233628SfabientSYSCTL_DECL(_kern_hwpmc); 235145256Sjkoshy 236174395Sjkoshystatic int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 237174395SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "callchaindepth", &pmc_callchaindepth); 238174395SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_TUN|CTLFLAG_RD, 239174395Sjkoshy &pmc_callchaindepth, 0, "depth of call chain records"); 240174395Sjkoshy 241153110Sru#ifdef DEBUG 242147191Sjkoshystruct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 243145256Sjkoshychar pmc_debugstr[PMC_DEBUG_STRSIZE]; 244145256SjkoshyTUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 245145256Sjkoshy sizeof(pmc_debugstr)); 246145256SjkoshySYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 247145256Sjkoshy CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN, 248145256Sjkoshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 249145256Sjkoshy#endif 250145256Sjkoshy 251145256Sjkoshy/* 252147191Sjkoshy * kern.hwpmc.hashrows -- determines the number of rows in the 253145256Sjkoshy * of the hash table used to look up threads 254145256Sjkoshy */ 255145256Sjkoshy 256145256Sjkoshystatic int pmc_hashsize = PMC_HASH_SIZE; 257145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize); 258145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD, 259145256Sjkoshy &pmc_hashsize, 0, "rows in hash tables"); 260145256Sjkoshy 261145256Sjkoshy/* 262174395Sjkoshy * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU 263145256Sjkoshy */ 264145256Sjkoshy 265147191Sjkoshystatic int pmc_nsamples = PMC_NSAMPLES; 266147191SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nsamples", &pmc_nsamples); 267147191SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_TUN|CTLFLAG_RD, 268147191Sjkoshy &pmc_nsamples, 0, "number of PC samples per CPU"); 269145256Sjkoshy 270174395Sjkoshy 271145256Sjkoshy/* 272147191Sjkoshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 273145256Sjkoshy */ 274145256Sjkoshy 275145256Sjkoshystatic int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 276145256SjkoshyTUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size); 277145256SjkoshySYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD, 278145256Sjkoshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 279145256Sjkoshy 280145256Sjkoshy 281145256Sjkoshy/* 282145256Sjkoshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 283145256Sjkoshy * allocate system-wide PMCs. 284145256Sjkoshy * 285145256Sjkoshy * Allowing unprivileged processes to allocate system PMCs is convenient 286145256Sjkoshy * if system-wide measurements need to be taken concurrently with other 287145256Sjkoshy * per-process measurements. This feature is turned off by default. 288145256Sjkoshy */ 289145256Sjkoshy 290145256Sjkoshystatic int pmc_unprivileged_syspmcs = 0; 291145256SjkoshyTUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs); 292145256SjkoshySYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW, 293145256Sjkoshy &pmc_unprivileged_syspmcs, 0, 294145256Sjkoshy "allow unprivileged process to allocate system PMCs"); 295145256Sjkoshy 296147191Sjkoshy/* 297147191Sjkoshy * Hash function. Discard the lower 2 bits of the pointer since 298147191Sjkoshy * these are always zero for our uses. The hash multiplier is 299147191Sjkoshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 300147191Sjkoshy */ 301145256Sjkoshy 302145256Sjkoshy#if LONG_BIT == 64 303145256Sjkoshy#define _PMC_HM 11400714819323198486u 304145256Sjkoshy#elif LONG_BIT == 32 305145256Sjkoshy#define _PMC_HM 2654435769u 306145256Sjkoshy#else 307145256Sjkoshy#error Must know the size of 'long' to compile 308145256Sjkoshy#endif 309145256Sjkoshy 310145256Sjkoshy#define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 311145256Sjkoshy 312145256Sjkoshy/* 313145256Sjkoshy * Syscall structures 314145256Sjkoshy */ 315145256Sjkoshy 316145256Sjkoshy/* The `sysent' for the new syscall */ 317145256Sjkoshystatic struct sysent pmc_sysent = { 318145256Sjkoshy 2, /* sy_narg */ 319145256Sjkoshy pmc_syscall_handler /* sy_call */ 320145256Sjkoshy}; 321145256Sjkoshy 322145256Sjkoshystatic struct syscall_module_data pmc_syscall_mod = { 323145256Sjkoshy load, 324145256Sjkoshy NULL, 325145256Sjkoshy &pmc_syscall_num, 326145256Sjkoshy &pmc_sysent, 327145256Sjkoshy { 0, NULL } 328145256Sjkoshy}; 329145256Sjkoshy 330145256Sjkoshystatic moduledata_t pmc_mod = { 331145256Sjkoshy PMC_MODULE_NAME, 332145256Sjkoshy syscall_module_handler, 333145256Sjkoshy &pmc_syscall_mod 334145256Sjkoshy}; 335145256Sjkoshy 336145256SjkoshyDECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 337145256SjkoshyMODULE_VERSION(pmc, PMC_VERSION); 338145256Sjkoshy 339153110Sru#ifdef DEBUG 340147191Sjkoshyenum pmc_dbgparse_state { 341147191Sjkoshy PMCDS_WS, /* in whitespace */ 342147191Sjkoshy PMCDS_MAJOR, /* seen a major keyword */ 343147191Sjkoshy PMCDS_MINOR 344147191Sjkoshy}; 345147191Sjkoshy 346145256Sjkoshystatic int 347145256Sjkoshypmc_debugflags_parse(char *newstr, char *fence) 348145256Sjkoshy{ 349145313Sjkoshy char c, *p, *q; 350147191Sjkoshy struct pmc_debugflags *tmpflags; 351147191Sjkoshy int error, found, *newbits, tmp; 352147191Sjkoshy size_t kwlen; 353145256Sjkoshy 354184214Sdes tmpflags = malloc(sizeof(*tmpflags), M_PMC, M_WAITOK|M_ZERO); 355145256Sjkoshy 356145256Sjkoshy p = newstr; 357147191Sjkoshy error = 0; 358145256Sjkoshy 359147191Sjkoshy for (; p < fence && (c = *p); p++) { 360145256Sjkoshy 361147191Sjkoshy /* skip white space */ 362147191Sjkoshy if (c == ' ' || c == '\t') 363147191Sjkoshy continue; 364147191Sjkoshy 365147191Sjkoshy /* look for a keyword followed by "=" */ 366147191Sjkoshy for (q = p; p < fence && (c = *p) && c != '='; p++) 367147191Sjkoshy ; 368147191Sjkoshy if (c != '=') { 369147191Sjkoshy error = EINVAL; 370147191Sjkoshy goto done; 371145256Sjkoshy } 372145256Sjkoshy 373147191Sjkoshy kwlen = p - q; 374147191Sjkoshy newbits = NULL; 375145256Sjkoshy 376147191Sjkoshy /* lookup flag group name */ 377147191Sjkoshy#define DBG_SET_FLAG_MAJ(S,F) \ 378147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 379147191Sjkoshy newbits = &tmpflags->pdb_ ## F; 380145256Sjkoshy 381147191Sjkoshy DBG_SET_FLAG_MAJ("cpu", CPU); 382147191Sjkoshy DBG_SET_FLAG_MAJ("csw", CSW); 383147191Sjkoshy DBG_SET_FLAG_MAJ("logging", LOG); 384147191Sjkoshy DBG_SET_FLAG_MAJ("module", MOD); 385147191Sjkoshy DBG_SET_FLAG_MAJ("md", MDP); 386147191Sjkoshy DBG_SET_FLAG_MAJ("owner", OWN); 387147191Sjkoshy DBG_SET_FLAG_MAJ("pmc", PMC); 388147191Sjkoshy DBG_SET_FLAG_MAJ("process", PRC); 389147191Sjkoshy DBG_SET_FLAG_MAJ("sampling", SAM); 390145256Sjkoshy 391147191Sjkoshy if (newbits == NULL) { 392147191Sjkoshy error = EINVAL; 393147191Sjkoshy goto done; 394145256Sjkoshy } 395145256Sjkoshy 396147191Sjkoshy p++; /* skip the '=' */ 397145256Sjkoshy 398147191Sjkoshy /* Now parse the individual flags */ 399147191Sjkoshy tmp = 0; 400147191Sjkoshy newflag: 401147191Sjkoshy for (q = p; p < fence && (c = *p); p++) 402147191Sjkoshy if (c == ' ' || c == '\t' || c == ',') 403147191Sjkoshy break; 404147191Sjkoshy 405147191Sjkoshy /* p == fence or c == ws or c == "," or c == 0 */ 406147191Sjkoshy 407147191Sjkoshy if ((kwlen = p - q) == 0) { 408147191Sjkoshy *newbits = tmp; 409147191Sjkoshy continue; 410147191Sjkoshy } 411147191Sjkoshy 412147191Sjkoshy found = 0; 413147191Sjkoshy#define DBG_SET_FLAG_MIN(S,F) \ 414147191Sjkoshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 415147191Sjkoshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 416147191Sjkoshy 417147191Sjkoshy /* a '*' denotes all possible flags in the group */ 418147191Sjkoshy if (kwlen == 1 && *q == '*') 419147191Sjkoshy tmp = found = ~0; 420147191Sjkoshy /* look for individual flag names */ 421147191Sjkoshy DBG_SET_FLAG_MIN("allocaterow", ALR); 422147191Sjkoshy DBG_SET_FLAG_MIN("allocate", ALL); 423147191Sjkoshy DBG_SET_FLAG_MIN("attach", ATT); 424147191Sjkoshy DBG_SET_FLAG_MIN("bind", BND); 425147191Sjkoshy DBG_SET_FLAG_MIN("config", CFG); 426147191Sjkoshy DBG_SET_FLAG_MIN("exec", EXC); 427147191Sjkoshy DBG_SET_FLAG_MIN("exit", EXT); 428147191Sjkoshy DBG_SET_FLAG_MIN("find", FND); 429147191Sjkoshy DBG_SET_FLAG_MIN("flush", FLS); 430147191Sjkoshy DBG_SET_FLAG_MIN("fork", FRK); 431147191Sjkoshy DBG_SET_FLAG_MIN("getbuf", GTB); 432147191Sjkoshy DBG_SET_FLAG_MIN("hook", PMH); 433147191Sjkoshy DBG_SET_FLAG_MIN("init", INI); 434147191Sjkoshy DBG_SET_FLAG_MIN("intr", INT); 435147191Sjkoshy DBG_SET_FLAG_MIN("linktarget", TLK); 436147191Sjkoshy DBG_SET_FLAG_MIN("mayberemove", OMR); 437147191Sjkoshy DBG_SET_FLAG_MIN("ops", OPS); 438147191Sjkoshy DBG_SET_FLAG_MIN("read", REA); 439147191Sjkoshy DBG_SET_FLAG_MIN("register", REG); 440147191Sjkoshy DBG_SET_FLAG_MIN("release", REL); 441147191Sjkoshy DBG_SET_FLAG_MIN("remove", ORM); 442147191Sjkoshy DBG_SET_FLAG_MIN("sample", SAM); 443147191Sjkoshy DBG_SET_FLAG_MIN("scheduleio", SIO); 444147191Sjkoshy DBG_SET_FLAG_MIN("select", SEL); 445147191Sjkoshy DBG_SET_FLAG_MIN("signal", SIG); 446147191Sjkoshy DBG_SET_FLAG_MIN("swi", SWI); 447147191Sjkoshy DBG_SET_FLAG_MIN("swo", SWO); 448147191Sjkoshy DBG_SET_FLAG_MIN("start", STA); 449147191Sjkoshy DBG_SET_FLAG_MIN("stop", STO); 450147191Sjkoshy DBG_SET_FLAG_MIN("syscall", PMS); 451147191Sjkoshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 452147191Sjkoshy DBG_SET_FLAG_MIN("write", WRI); 453147191Sjkoshy if (found == 0) { 454147191Sjkoshy /* unrecognized flag name */ 455147191Sjkoshy error = EINVAL; 456147191Sjkoshy goto done; 457147191Sjkoshy } 458147191Sjkoshy 459147191Sjkoshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 460147191Sjkoshy *newbits = tmp; 461147191Sjkoshy continue; 462147191Sjkoshy } 463147191Sjkoshy 464147191Sjkoshy p++; 465147191Sjkoshy goto newflag; 466145256Sjkoshy } 467145256Sjkoshy 468147191Sjkoshy /* save the new flag set */ 469147191Sjkoshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 470145256Sjkoshy 471147191Sjkoshy done: 472184205Sdes free(tmpflags, M_PMC); 473147191Sjkoshy return error; 474145256Sjkoshy} 475145256Sjkoshy 476145256Sjkoshystatic int 477145256Sjkoshypmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 478145256Sjkoshy{ 479145256Sjkoshy char *fence, *newstr; 480145256Sjkoshy int error; 481145256Sjkoshy unsigned int n; 482145256Sjkoshy 483145256Sjkoshy (void) arg1; (void) arg2; /* unused parameters */ 484145256Sjkoshy 485145256Sjkoshy n = sizeof(pmc_debugstr); 486184802Sjkoshy newstr = malloc(n, M_PMC, M_WAITOK|M_ZERO); 487147191Sjkoshy (void) strlcpy(newstr, pmc_debugstr, n); 488145256Sjkoshy 489145256Sjkoshy error = sysctl_handle_string(oidp, newstr, n, req); 490145256Sjkoshy 491145256Sjkoshy /* if there is a new string, parse and copy it */ 492145256Sjkoshy if (error == 0 && req->newptr != NULL) { 493147191Sjkoshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 494145256Sjkoshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 495145256Sjkoshy (void) strlcpy(pmc_debugstr, newstr, 496145256Sjkoshy sizeof(pmc_debugstr)); 497145256Sjkoshy } 498145256Sjkoshy 499184205Sdes free(newstr, M_PMC); 500145256Sjkoshy 501145256Sjkoshy return error; 502145256Sjkoshy} 503145256Sjkoshy#endif 504145256Sjkoshy 505145256Sjkoshy/* 506184802Sjkoshy * Map a row index to a classdep structure and return the adjusted row 507184802Sjkoshy * index for the PMC class index. 508184802Sjkoshy */ 509184802Sjkoshystatic struct pmc_classdep * 510184802Sjkoshypmc_ri_to_classdep(struct pmc_mdep *md, int ri, int *adjri) 511184802Sjkoshy{ 512184802Sjkoshy struct pmc_classdep *pcd; 513184802Sjkoshy 514184802Sjkoshy (void) md; 515184802Sjkoshy 516184802Sjkoshy KASSERT(ri >= 0 && ri < md->pmd_npmc, 517184802Sjkoshy ("[pmc,%d] illegal row-index %d", __LINE__, ri)); 518184802Sjkoshy 519184802Sjkoshy pcd = pmc_rowindex_to_classdep[ri]; 520184802Sjkoshy 521184802Sjkoshy KASSERT(pcd != NULL, 522198204Srpaulo ("[pmc,%d] ri %d null pcd", __LINE__, ri)); 523184802Sjkoshy 524184802Sjkoshy *adjri = ri - pcd->pcd_ri; 525184802Sjkoshy 526184802Sjkoshy KASSERT(*adjri >= 0 && *adjri < pcd->pcd_num, 527184802Sjkoshy ("[pmc,%d] adjusted row-index %d", __LINE__, *adjri)); 528184802Sjkoshy 529184802Sjkoshy return (pcd); 530184802Sjkoshy} 531184802Sjkoshy 532184802Sjkoshy/* 533145256Sjkoshy * Concurrency Control 534145256Sjkoshy * 535145256Sjkoshy * The driver manages the following data structures: 536145256Sjkoshy * 537145256Sjkoshy * - target process descriptors, one per target process 538145256Sjkoshy * - owner process descriptors (and attached lists), one per owner process 539145256Sjkoshy * - lookup hash tables for owner and target processes 540145256Sjkoshy * - PMC descriptors (and attached lists) 541145256Sjkoshy * - per-cpu hardware state 542145256Sjkoshy * - the 'hook' variable through which the kernel calls into 543145256Sjkoshy * this module 544145256Sjkoshy * - the machine hardware state (managed by the MD layer) 545145256Sjkoshy * 546145256Sjkoshy * These data structures are accessed from: 547145256Sjkoshy * 548145256Sjkoshy * - thread context-switch code 549145256Sjkoshy * - interrupt handlers (possibly on multiple cpus) 550145256Sjkoshy * - kernel threads on multiple cpus running on behalf of user 551145256Sjkoshy * processes doing system calls 552145256Sjkoshy * - this driver's private kernel threads 553145256Sjkoshy * 554145256Sjkoshy * = Locks and Locking strategy = 555145256Sjkoshy * 556145256Sjkoshy * The driver uses four locking strategies for its operation: 557145256Sjkoshy * 558168856Sjkoshy * - The global SX lock "pmc_sx" is used to protect internal 559168856Sjkoshy * data structures. 560145256Sjkoshy * 561168856Sjkoshy * Calls into the module by syscall() start with this lock being 562168856Sjkoshy * held in exclusive mode. Depending on the requested operation, 563168856Sjkoshy * the lock may be downgraded to 'shared' mode to allow more 564168856Sjkoshy * concurrent readers into the module. Calls into the module from 565168856Sjkoshy * other parts of the kernel acquire the lock in shared mode. 566145256Sjkoshy * 567145256Sjkoshy * This SX lock is held in exclusive mode for any operations that 568145256Sjkoshy * modify the linkages between the driver's internal data structures. 569145256Sjkoshy * 570145256Sjkoshy * The 'pmc_hook' function pointer is also protected by this lock. 571145256Sjkoshy * It is only examined with the sx lock held in exclusive mode. The 572168856Sjkoshy * kernel module is allowed to be unloaded only with the sx lock held 573168856Sjkoshy * in exclusive mode. In normal syscall handling, after acquiring the 574168856Sjkoshy * pmc_sx lock we first check that 'pmc_hook' is non-null before 575168856Sjkoshy * proceeding. This prevents races between the thread unloading the module 576168856Sjkoshy * and other threads seeking to use the module. 577145256Sjkoshy * 578145256Sjkoshy * - Lookups of target process structures and owner process structures 579145256Sjkoshy * cannot use the global "pmc_sx" SX lock because these lookups need 580145256Sjkoshy * to happen during context switches and in other critical sections 581145256Sjkoshy * where sleeping is not allowed. We protect these lookup tables 582145256Sjkoshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 583168856Sjkoshy * "pmc_ownerhash_mtx". 584145256Sjkoshy * 585145256Sjkoshy * - Interrupt handlers work in a lock free manner. At interrupt 586145256Sjkoshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 587145256Sjkoshy * when the PMC was started. If this pointer is NULL, the interrupt 588145256Sjkoshy * is ignored after updating driver statistics. We ensure that this 589145256Sjkoshy * pointer is set (using an atomic operation if necessary) before the 590145256Sjkoshy * PMC hardware is started. Conversely, this pointer is unset atomically 591145256Sjkoshy * only after the PMC hardware is stopped. 592145256Sjkoshy * 593145256Sjkoshy * We ensure that everything needed for the operation of an 594145256Sjkoshy * interrupt handler is available without it needing to acquire any 595145256Sjkoshy * locks. We also ensure that a PMC's software state is destroyed only 596145256Sjkoshy * after the PMC is taken off hardware (on all CPUs). 597145256Sjkoshy * 598145256Sjkoshy * - Context-switch handling with process-private PMCs needs more 599145256Sjkoshy * care. 600145256Sjkoshy * 601145256Sjkoshy * A given process may be the target of multiple PMCs. For example, 602145256Sjkoshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 603145256Sjkoshy * while the target process is running on another. A PMC could also 604145256Sjkoshy * be getting released because its owner is exiting. We tackle 605145256Sjkoshy * these situations in the following manner: 606145256Sjkoshy * 607145256Sjkoshy * - each target process structure 'pmc_process' has an array 608145256Sjkoshy * of 'struct pmc *' pointers, one for each hardware PMC. 609145256Sjkoshy * 610145256Sjkoshy * - At context switch IN time, each "target" PMC in RUNNING state 611145256Sjkoshy * gets started on hardware and a pointer to each PMC is copied into 612145256Sjkoshy * the per-cpu phw array. The 'runcount' for the PMC is 613145256Sjkoshy * incremented. 614145256Sjkoshy * 615145256Sjkoshy * - At context switch OUT time, all process-virtual PMCs are stopped 616145256Sjkoshy * on hardware. The saved value is added to the PMCs value field 617145256Sjkoshy * only if the PMC is in a non-deleted state (the PMCs state could 618145256Sjkoshy * have changed during the current time slice). 619145256Sjkoshy * 620145256Sjkoshy * Note that since in-between a switch IN on a processor and a switch 621145256Sjkoshy * OUT, the PMC could have been released on another CPU. Therefore 622145256Sjkoshy * context switch OUT always looks at the hardware state to turn 623145256Sjkoshy * OFF PMCs and will update a PMC's saved value only if reachable 624145256Sjkoshy * from the target process record. 625145256Sjkoshy * 626145256Sjkoshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 627145256Sjkoshy * be attached to many processes at the time of the call and could 628145256Sjkoshy * be active on multiple CPUs). 629145256Sjkoshy * 630145256Sjkoshy * We prevent further scheduling of the PMC by marking it as in 631145256Sjkoshy * state 'DELETED'. If the runcount of the PMC is non-zero then 632145256Sjkoshy * this PMC is currently running on a CPU somewhere. The thread 633167086Sjhb * doing the PMCRELEASE operation waits by repeatedly doing a 634167086Sjhb * pause() till the runcount comes to zero. 635145256Sjkoshy * 636168856Sjkoshy * The contents of a PMC descriptor (struct pmc) are protected using 637168856Sjkoshy * a spin-mutex. In order to save space, we use a mutex pool. 638168856Sjkoshy * 639168856Sjkoshy * In terms of lock types used by witness(4), we use: 640168856Sjkoshy * - Type "pmc-sx", used by the global SX lock. 641168856Sjkoshy * - Type "pmc-sleep", for sleep mutexes used by logger threads. 642168856Sjkoshy * - Type "pmc-per-proc", for protecting PMC owner descriptors. 643168856Sjkoshy * - Type "pmc-leaf", used for all other spin mutexes. 644145256Sjkoshy */ 645145256Sjkoshy 646145256Sjkoshy/* 647145256Sjkoshy * save the cpu binding of the current kthread 648145256Sjkoshy */ 649145256Sjkoshy 650145256Sjkoshystatic void 651145256Sjkoshypmc_save_cpu_binding(struct pmc_binding *pb) 652145256Sjkoshy{ 653145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "save-cpu"); 654170307Sjeff thread_lock(curthread); 655145256Sjkoshy pb->pb_bound = sched_is_bound(curthread); 656145256Sjkoshy pb->pb_cpu = curthread->td_oncpu; 657170307Sjeff thread_unlock(curthread); 658145256Sjkoshy PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 659145256Sjkoshy} 660145256Sjkoshy 661145256Sjkoshy/* 662145256Sjkoshy * restore the cpu binding of the current thread 663145256Sjkoshy */ 664145256Sjkoshy 665145256Sjkoshystatic void 666145256Sjkoshypmc_restore_cpu_binding(struct pmc_binding *pb) 667145256Sjkoshy{ 668145256Sjkoshy PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 669145256Sjkoshy curthread->td_oncpu, pb->pb_cpu); 670170307Sjeff thread_lock(curthread); 671145256Sjkoshy if (pb->pb_bound) 672145256Sjkoshy sched_bind(curthread, pb->pb_cpu); 673145256Sjkoshy else 674145256Sjkoshy sched_unbind(curthread); 675170307Sjeff thread_unlock(curthread); 676145256Sjkoshy PMCDBG(CPU,BND,2, "%s", "restore-cpu done"); 677145256Sjkoshy} 678145256Sjkoshy 679145256Sjkoshy/* 680145256Sjkoshy * move execution over the specified cpu and bind it there. 681145256Sjkoshy */ 682145256Sjkoshy 683145256Sjkoshystatic void 684145256Sjkoshypmc_select_cpu(int cpu) 685145256Sjkoshy{ 686183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 687145256Sjkoshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 688145256Sjkoshy 689183266Sjkoshy /* Never move to an inactive CPU. */ 690183266Sjkoshy KASSERT(pmc_cpu_is_active(cpu), ("[pmc,%d] selecting inactive " 691183266Sjkoshy "CPU %d", __LINE__, cpu)); 692145256Sjkoshy 693145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu); 694170307Sjeff thread_lock(curthread); 695145256Sjkoshy sched_bind(curthread, cpu); 696170307Sjeff thread_unlock(curthread); 697145256Sjkoshy 698145256Sjkoshy KASSERT(curthread->td_oncpu == cpu, 699145256Sjkoshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 700145256Sjkoshy cpu, curthread->td_oncpu)); 701145256Sjkoshy 702145256Sjkoshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 703145256Sjkoshy} 704145256Sjkoshy 705145256Sjkoshy/* 706145774Sjkoshy * Force a context switch. 707145774Sjkoshy * 708167086Sjhb * We do this by pause'ing for 1 tick -- invoking mi_switch() is not 709145774Sjkoshy * guaranteed to force a context switch. 710145774Sjkoshy */ 711145774Sjkoshy 712145774Sjkoshystatic void 713145774Sjkoshypmc_force_context_switch(void) 714145774Sjkoshy{ 715145774Sjkoshy 716167086Sjhb pause("pmcctx", 1); 717145774Sjkoshy} 718145774Sjkoshy 719145774Sjkoshy/* 720147191Sjkoshy * Get the file name for an executable. This is a simple wrapper 721147191Sjkoshy * around vn_fullpath(9). 722145256Sjkoshy */ 723145256Sjkoshy 724147191Sjkoshystatic void 725147708Sjkoshypmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 726145256Sjkoshy{ 727145256Sjkoshy 728147191Sjkoshy *fullpath = "unknown"; 729147191Sjkoshy *freepath = NULL; 730175294Sattilio vn_fullpath(curthread, v, fullpath, freepath); 731145256Sjkoshy} 732145256Sjkoshy 733145256Sjkoshy/* 734145256Sjkoshy * remove an process owning PMCs 735145256Sjkoshy */ 736145256Sjkoshy 737145256Sjkoshyvoid 738145256Sjkoshypmc_remove_owner(struct pmc_owner *po) 739145256Sjkoshy{ 740147191Sjkoshy struct pmc *pm, *tmp; 741145256Sjkoshy 742145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 743145256Sjkoshy 744145256Sjkoshy PMCDBG(OWN,ORM,1, "remove-owner po=%p", po); 745145256Sjkoshy 746145256Sjkoshy /* Remove descriptor from the owner hash table */ 747145256Sjkoshy LIST_REMOVE(po, po_next); 748145256Sjkoshy 749147191Sjkoshy /* release all owned PMC descriptors */ 750147191Sjkoshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 751147191Sjkoshy PMCDBG(OWN,ORM,2, "pmc=%p", pm); 752147191Sjkoshy KASSERT(pm->pm_owner == po, 753147191Sjkoshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 754145256Sjkoshy 755147191Sjkoshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 756145256Sjkoshy } 757145256Sjkoshy 758147191Sjkoshy KASSERT(po->po_sscount == 0, 759147191Sjkoshy ("[pmc,%d] SS count not zero", __LINE__)); 760145256Sjkoshy KASSERT(LIST_EMPTY(&po->po_pmcs), 761147191Sjkoshy ("[pmc,%d] PMC list not empty", __LINE__)); 762145256Sjkoshy 763147191Sjkoshy /* de-configure the log file if present */ 764145774Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 765147191Sjkoshy pmclog_deconfigure_log(po); 766145256Sjkoshy} 767145256Sjkoshy 768145256Sjkoshy/* 769145256Sjkoshy * remove an owner process record if all conditions are met. 770145256Sjkoshy */ 771145256Sjkoshy 772145256Sjkoshystatic void 773145256Sjkoshypmc_maybe_remove_owner(struct pmc_owner *po) 774145256Sjkoshy{ 775145256Sjkoshy 776145256Sjkoshy PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po); 777145256Sjkoshy 778145256Sjkoshy /* 779145256Sjkoshy * Remove owner record if 780145256Sjkoshy * - this process does not own any PMCs 781145256Sjkoshy * - this process has not allocated a system-wide sampling buffer 782145256Sjkoshy */ 783145256Sjkoshy 784145256Sjkoshy if (LIST_EMPTY(&po->po_pmcs) && 785145774Sjkoshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 786145256Sjkoshy pmc_remove_owner(po); 787147191Sjkoshy pmc_destroy_owner_descriptor(po); 788145256Sjkoshy } 789145256Sjkoshy} 790145256Sjkoshy 791145256Sjkoshy/* 792145256Sjkoshy * Add an association between a target process and a PMC. 793145256Sjkoshy */ 794145256Sjkoshy 795145256Sjkoshystatic void 796145256Sjkoshypmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 797145256Sjkoshy{ 798145256Sjkoshy int ri; 799145256Sjkoshy struct pmc_target *pt; 800145256Sjkoshy 801145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 802145256Sjkoshy 803145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 804145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 805147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 806147191Sjkoshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 807147191Sjkoshy __LINE__, pm, pp->pp_proc->p_pid)); 808198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= ((int) md->pmd_npmc - 1), 809145256Sjkoshy ("[pmc,%d] Illegal reference count %d for process record %p", 810145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 811145256Sjkoshy 812145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 813145256Sjkoshy 814145256Sjkoshy PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 815145256Sjkoshy pm, ri, pp); 816145256Sjkoshy 817153110Sru#ifdef DEBUG 818145256Sjkoshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 819145256Sjkoshy if (pt->pt_process == pp) 820145256Sjkoshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 821145256Sjkoshy __LINE__, pp, pm)); 822145256Sjkoshy#endif 823145256Sjkoshy 824184802Sjkoshy pt = malloc(sizeof(struct pmc_target), M_PMC, M_WAITOK|M_ZERO); 825145256Sjkoshy pt->pt_process = pp; 826145256Sjkoshy 827145256Sjkoshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 828145256Sjkoshy 829148067Sjhb atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 830148067Sjhb (uintptr_t)pm); 831145256Sjkoshy 832145615Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) 833145774Sjkoshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 834145615Sjkoshy 835147191Sjkoshy /* 836147191Sjkoshy * Initialize the per-process values at this row index. 837147191Sjkoshy */ 838147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 839147191Sjkoshy pm->pm_sc.pm_reloadcount : 0; 840147191Sjkoshy 841145256Sjkoshy pp->pp_refcnt++; 842145256Sjkoshy 843145256Sjkoshy} 844145256Sjkoshy 845145256Sjkoshy/* 846145256Sjkoshy * Removes the association between a target process and a PMC. 847145256Sjkoshy */ 848145256Sjkoshy 849145256Sjkoshystatic void 850145256Sjkoshypmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 851145256Sjkoshy{ 852145256Sjkoshy int ri; 853147191Sjkoshy struct proc *p; 854145256Sjkoshy struct pmc_target *ptgt; 855145256Sjkoshy 856145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 857145256Sjkoshy 858145256Sjkoshy KASSERT(pm != NULL && pp != NULL, 859145256Sjkoshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 860145256Sjkoshy 861198343Sfabient KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt <= (int) md->pmd_npmc, 862145256Sjkoshy ("[pmc,%d] Illegal ref count %d on process record %p", 863145256Sjkoshy __LINE__, pp->pp_refcnt, (void *) pp)); 864145256Sjkoshy 865145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 866145256Sjkoshy 867145256Sjkoshy PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 868145256Sjkoshy pm, ri, pp); 869145256Sjkoshy 870145256Sjkoshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 871145256Sjkoshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 872145256Sjkoshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 873145256Sjkoshy 874145256Sjkoshy pp->pp_pmcs[ri].pp_pmc = NULL; 875145256Sjkoshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 876145256Sjkoshy 877145774Sjkoshy /* Remove owner-specific flags */ 878145774Sjkoshy if (pm->pm_owner->po_owner == pp->pp_proc) { 879145774Sjkoshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 880145774Sjkoshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 881145774Sjkoshy } 882145615Sjkoshy 883145256Sjkoshy pp->pp_refcnt--; 884145256Sjkoshy 885145256Sjkoshy /* Remove the target process from the PMC structure */ 886145256Sjkoshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 887145256Sjkoshy if (ptgt->pt_process == pp) 888145256Sjkoshy break; 889145256Sjkoshy 890145256Sjkoshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 891145256Sjkoshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 892145256Sjkoshy 893145256Sjkoshy LIST_REMOVE(ptgt, pt_next); 894184205Sdes free(ptgt, M_PMC); 895145256Sjkoshy 896147191Sjkoshy /* if the PMC now lacks targets, send the owner a SIGIO */ 897147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) { 898147191Sjkoshy p = pm->pm_owner->po_owner; 899147191Sjkoshy PROC_LOCK(p); 900225617Skmacy kern_psignal(p, SIGIO); 901147191Sjkoshy PROC_UNLOCK(p); 902145256Sjkoshy 903147191Sjkoshy PMCDBG(PRC,SIG,2, "signalling proc=%p signal=%d", p, 904147191Sjkoshy SIGIO); 905145256Sjkoshy } 906145256Sjkoshy} 907145256Sjkoshy 908145256Sjkoshy/* 909145256Sjkoshy * Check if PMC 'pm' may be attached to target process 't'. 910145256Sjkoshy */ 911145256Sjkoshy 912145256Sjkoshystatic int 913145256Sjkoshypmc_can_attach(struct pmc *pm, struct proc *t) 914145256Sjkoshy{ 915145256Sjkoshy struct proc *o; /* pmc owner */ 916145256Sjkoshy struct ucred *oc, *tc; /* owner, target credentials */ 917145256Sjkoshy int decline_attach, i; 918145256Sjkoshy 919145256Sjkoshy /* 920145256Sjkoshy * A PMC's owner can always attach that PMC to itself. 921145256Sjkoshy */ 922145256Sjkoshy 923145256Sjkoshy if ((o = pm->pm_owner->po_owner) == t) 924145256Sjkoshy return 0; 925145256Sjkoshy 926145256Sjkoshy PROC_LOCK(o); 927145256Sjkoshy oc = o->p_ucred; 928145256Sjkoshy crhold(oc); 929145256Sjkoshy PROC_UNLOCK(o); 930145256Sjkoshy 931145256Sjkoshy PROC_LOCK(t); 932145256Sjkoshy tc = t->p_ucred; 933145256Sjkoshy crhold(tc); 934145256Sjkoshy PROC_UNLOCK(t); 935145256Sjkoshy 936145256Sjkoshy /* 937145256Sjkoshy * The effective uid of the PMC owner should match at least one 938145256Sjkoshy * of the {effective,real,saved} uids of the target process. 939145256Sjkoshy */ 940145256Sjkoshy 941145256Sjkoshy decline_attach = oc->cr_uid != tc->cr_uid && 942145256Sjkoshy oc->cr_uid != tc->cr_svuid && 943145256Sjkoshy oc->cr_uid != tc->cr_ruid; 944145256Sjkoshy 945145256Sjkoshy /* 946145256Sjkoshy * Every one of the target's group ids, must be in the owner's 947145256Sjkoshy * group list. 948145256Sjkoshy */ 949145256Sjkoshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 950145256Sjkoshy decline_attach = !groupmember(tc->cr_groups[i], oc); 951145256Sjkoshy 952145256Sjkoshy /* check the read and saved gids too */ 953145256Sjkoshy if (decline_attach == 0) 954145256Sjkoshy decline_attach = !groupmember(tc->cr_rgid, oc) || 955145256Sjkoshy !groupmember(tc->cr_svgid, oc); 956145256Sjkoshy 957145256Sjkoshy crfree(tc); 958145256Sjkoshy crfree(oc); 959145256Sjkoshy 960145256Sjkoshy return !decline_attach; 961145256Sjkoshy} 962145256Sjkoshy 963145256Sjkoshy/* 964145256Sjkoshy * Attach a process to a PMC. 965145256Sjkoshy */ 966145256Sjkoshy 967145256Sjkoshystatic int 968145256Sjkoshypmc_attach_one_process(struct proc *p, struct pmc *pm) 969145256Sjkoshy{ 970145256Sjkoshy int ri; 971147191Sjkoshy char *fullpath, *freepath; 972145256Sjkoshy struct pmc_process *pp; 973145256Sjkoshy 974145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 975145256Sjkoshy 976145256Sjkoshy PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 977145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 978145256Sjkoshy 979145256Sjkoshy /* 980145256Sjkoshy * Locate the process descriptor corresponding to process 'p', 981145256Sjkoshy * allocating space as needed. 982145256Sjkoshy * 983145256Sjkoshy * Verify that rowindex 'pm_rowindex' is free in the process 984145256Sjkoshy * descriptor. 985145256Sjkoshy * 986145256Sjkoshy * If not, allocate space for a descriptor and link the 987145256Sjkoshy * process descriptor and PMC. 988145256Sjkoshy */ 989145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 990145256Sjkoshy 991145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 992145256Sjkoshy return ENOMEM; 993145256Sjkoshy 994145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 995145256Sjkoshy return EEXIST; 996145256Sjkoshy 997145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 998145256Sjkoshy return EBUSY; 999145256Sjkoshy 1000145256Sjkoshy pmc_link_target_process(pm, pp); 1001145256Sjkoshy 1002147191Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 1003147191Sjkoshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 1004147191Sjkoshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 1005147191Sjkoshy 1006147191Sjkoshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 1007147191Sjkoshy 1008147191Sjkoshy /* issue an attach event to a configured log file */ 1009147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 1010147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1011180794Sjeff if (p->p_flag & P_KTHREAD) { 1012180794Sjeff fullpath = kernelname; 1013180794Sjeff freepath = NULL; 1014180794Sjeff } else 1015180794Sjeff pmclog_process_pmcattach(pm, p->p_pid, fullpath); 1016147191Sjkoshy if (freepath) 1017184205Sdes free(freepath, M_TEMP); 1018174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1019174395Sjkoshy pmc_log_process_mappings(pm->pm_owner, p); 1020147191Sjkoshy } 1021145256Sjkoshy /* mark process as using HWPMCs */ 1022145256Sjkoshy PROC_LOCK(p); 1023145256Sjkoshy p->p_flag |= P_HWPMC; 1024145256Sjkoshy PROC_UNLOCK(p); 1025145256Sjkoshy 1026145256Sjkoshy return 0; 1027145256Sjkoshy} 1028145256Sjkoshy 1029145256Sjkoshy/* 1030145256Sjkoshy * Attach a process and optionally its children 1031145256Sjkoshy */ 1032145256Sjkoshy 1033145256Sjkoshystatic int 1034145256Sjkoshypmc_attach_process(struct proc *p, struct pmc *pm) 1035145256Sjkoshy{ 1036145256Sjkoshy int error; 1037145256Sjkoshy struct proc *top; 1038145256Sjkoshy 1039145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1040145256Sjkoshy 1041145256Sjkoshy PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 1042145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1043145256Sjkoshy 1044145774Sjkoshy 1045145774Sjkoshy /* 1046145774Sjkoshy * If this PMC successfully allowed a GETMSR operation 1047145774Sjkoshy * in the past, disallow further ATTACHes. 1048145774Sjkoshy */ 1049145774Sjkoshy 1050145774Sjkoshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 1051145774Sjkoshy return EPERM; 1052145774Sjkoshy 1053145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1054145256Sjkoshy return pmc_attach_one_process(p, pm); 1055145256Sjkoshy 1056145256Sjkoshy /* 1057145256Sjkoshy * Traverse all child processes, attaching them to 1058145256Sjkoshy * this PMC. 1059145256Sjkoshy */ 1060145256Sjkoshy 1061145256Sjkoshy sx_slock(&proctree_lock); 1062145256Sjkoshy 1063145256Sjkoshy top = p; 1064145256Sjkoshy 1065145256Sjkoshy for (;;) { 1066145256Sjkoshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1067145256Sjkoshy break; 1068145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1069145256Sjkoshy p = LIST_FIRST(&p->p_children); 1070145256Sjkoshy else for (;;) { 1071145256Sjkoshy if (p == top) 1072145256Sjkoshy goto done; 1073145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1074145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1075145256Sjkoshy break; 1076145256Sjkoshy } 1077145256Sjkoshy p = p->p_pptr; 1078145256Sjkoshy } 1079145256Sjkoshy } 1080145256Sjkoshy 1081145256Sjkoshy if (error) 1082145256Sjkoshy (void) pmc_detach_process(top, pm); 1083145256Sjkoshy 1084145256Sjkoshy done: 1085145256Sjkoshy sx_sunlock(&proctree_lock); 1086145256Sjkoshy return error; 1087145256Sjkoshy} 1088145256Sjkoshy 1089145256Sjkoshy/* 1090145256Sjkoshy * Detach a process from a PMC. If there are no other PMCs tracking 1091145256Sjkoshy * this process, remove the process structure from its hash table. If 1092145256Sjkoshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1093145256Sjkoshy */ 1094145256Sjkoshy 1095145256Sjkoshystatic int 1096145256Sjkoshypmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1097145256Sjkoshy{ 1098145256Sjkoshy int ri; 1099145256Sjkoshy struct pmc_process *pp; 1100145256Sjkoshy 1101145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1102145256Sjkoshy 1103145256Sjkoshy KASSERT(pm != NULL, 1104145256Sjkoshy ("[pmc,%d] null pm pointer", __LINE__)); 1105145256Sjkoshy 1106145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 1107145774Sjkoshy 1108145256Sjkoshy PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1109145774Sjkoshy pm, ri, p, p->p_pid, p->p_comm, flags); 1110145256Sjkoshy 1111145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1112145256Sjkoshy return ESRCH; 1113145256Sjkoshy 1114145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1115145256Sjkoshy return EINVAL; 1116145256Sjkoshy 1117145256Sjkoshy pmc_unlink_target_process(pm, pp); 1118145256Sjkoshy 1119147191Sjkoshy /* Issue a detach entry if a log file is configured */ 1120147191Sjkoshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1121147191Sjkoshy pmclog_process_pmcdetach(pm, p->p_pid); 1122147191Sjkoshy 1123145256Sjkoshy /* 1124145256Sjkoshy * If there are no PMCs targetting this process, we remove its 1125145256Sjkoshy * descriptor from the target hash table and unset the P_HWPMC 1126145256Sjkoshy * flag in the struct proc. 1127145256Sjkoshy */ 1128198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1129145256Sjkoshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1130145256Sjkoshy __LINE__, pp->pp_refcnt, pp)); 1131145256Sjkoshy 1132145256Sjkoshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1133145256Sjkoshy return 0; 1134145256Sjkoshy 1135145256Sjkoshy pmc_remove_process_descriptor(pp); 1136145256Sjkoshy 1137145256Sjkoshy if (flags & PMC_FLAG_REMOVE) 1138184205Sdes free(pp, M_PMC); 1139145256Sjkoshy 1140145256Sjkoshy PROC_LOCK(p); 1141145256Sjkoshy p->p_flag &= ~P_HWPMC; 1142145256Sjkoshy PROC_UNLOCK(p); 1143145256Sjkoshy 1144145256Sjkoshy return 0; 1145145256Sjkoshy} 1146145256Sjkoshy 1147145256Sjkoshy/* 1148145256Sjkoshy * Detach a process and optionally its descendants from a PMC. 1149145256Sjkoshy */ 1150145256Sjkoshy 1151145256Sjkoshystatic int 1152145256Sjkoshypmc_detach_process(struct proc *p, struct pmc *pm) 1153145256Sjkoshy{ 1154145256Sjkoshy struct proc *top; 1155145256Sjkoshy 1156145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1157145256Sjkoshy 1158145256Sjkoshy PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1159145774Sjkoshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1160145256Sjkoshy 1161145256Sjkoshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1162145256Sjkoshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1163145256Sjkoshy 1164145256Sjkoshy /* 1165145256Sjkoshy * Traverse all children, detaching them from this PMC. We 1166145256Sjkoshy * ignore errors since we could be detaching a PMC from a 1167145256Sjkoshy * partially attached proc tree. 1168145256Sjkoshy */ 1169145256Sjkoshy 1170145256Sjkoshy sx_slock(&proctree_lock); 1171145256Sjkoshy 1172145256Sjkoshy top = p; 1173145256Sjkoshy 1174145256Sjkoshy for (;;) { 1175145256Sjkoshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1176145256Sjkoshy 1177145256Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1178145256Sjkoshy p = LIST_FIRST(&p->p_children); 1179145256Sjkoshy else for (;;) { 1180145256Sjkoshy if (p == top) 1181145256Sjkoshy goto done; 1182145256Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1183145256Sjkoshy p = LIST_NEXT(p, p_sibling); 1184145256Sjkoshy break; 1185145256Sjkoshy } 1186145256Sjkoshy p = p->p_pptr; 1187145256Sjkoshy } 1188145256Sjkoshy } 1189145256Sjkoshy 1190145256Sjkoshy done: 1191145256Sjkoshy sx_sunlock(&proctree_lock); 1192147191Sjkoshy 1193147191Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 1194147191Sjkoshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1195147191Sjkoshy 1196145256Sjkoshy return 0; 1197145256Sjkoshy} 1198145256Sjkoshy 1199147191Sjkoshy 1200145256Sjkoshy/* 1201147191Sjkoshy * Thread context switch IN 1202145256Sjkoshy */ 1203145256Sjkoshy 1204147191Sjkoshystatic void 1205147191Sjkoshypmc_process_csw_in(struct thread *td) 1206147191Sjkoshy{ 1207147191Sjkoshy int cpu; 1208184802Sjkoshy unsigned int adjri, ri; 1209147191Sjkoshy struct pmc *pm; 1210147191Sjkoshy struct proc *p; 1211147191Sjkoshy struct pmc_cpu *pc; 1212147191Sjkoshy struct pmc_hw *phw; 1213184802Sjkoshy pmc_value_t newvalue; 1214147191Sjkoshy struct pmc_process *pp; 1215184802Sjkoshy struct pmc_classdep *pcd; 1216145256Sjkoshy 1217147191Sjkoshy p = td->td_proc; 1218145256Sjkoshy 1219147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1220147191Sjkoshy return; 1221145256Sjkoshy 1222147191Sjkoshy KASSERT(pp->pp_proc == td->td_proc, 1223147191Sjkoshy ("[pmc,%d] not my thread state", __LINE__)); 1224145256Sjkoshy 1225147191Sjkoshy critical_enter(); /* no preemption from this point */ 1226145256Sjkoshy 1227147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1228145256Sjkoshy 1229147191Sjkoshy PMCDBG(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1230147191Sjkoshy p->p_pid, p->p_comm, pp); 1231145256Sjkoshy 1232183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1233147191Sjkoshy ("[pmc,%d] wierd CPU id %d", __LINE__, cpu)); 1234145256Sjkoshy 1235147191Sjkoshy pc = pmc_pcpu[cpu]; 1236145256Sjkoshy 1237147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1238145256Sjkoshy 1239147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1240147191Sjkoshy continue; 1241147191Sjkoshy 1242147191Sjkoshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1243147191Sjkoshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1244147191Sjkoshy __LINE__, PMC_TO_MODE(pm))); 1245147191Sjkoshy 1246147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1247147191Sjkoshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1248147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1249147191Sjkoshy 1250145256Sjkoshy /* 1251147191Sjkoshy * Only PMCs that are marked as 'RUNNING' need 1252147191Sjkoshy * be placed on hardware. 1253145256Sjkoshy */ 1254145256Sjkoshy 1255147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 1256147191Sjkoshy continue; 1257145256Sjkoshy 1258147191Sjkoshy /* increment PMC runcount */ 1259208861Sfabient atomic_add_rel_int(&pm->pm_runcount, 1); 1260145256Sjkoshy 1261147191Sjkoshy /* configure the HWPMC we are going to use. */ 1262184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1263184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, pm); 1264145256Sjkoshy 1265147191Sjkoshy phw = pc->pc_hwpmcs[ri]; 1266145256Sjkoshy 1267147191Sjkoshy KASSERT(phw != NULL, 1268147191Sjkoshy ("[pmc,%d] null hw pointer", __LINE__)); 1269145256Sjkoshy 1270147191Sjkoshy KASSERT(phw->phw_pmc == pm, 1271147191Sjkoshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1272147191Sjkoshy phw->phw_pmc, pm)); 1273145256Sjkoshy 1274147191Sjkoshy /* 1275147191Sjkoshy * Write out saved value and start the PMC. 1276147191Sjkoshy * 1277147191Sjkoshy * Sampling PMCs use a per-process value, while 1278147191Sjkoshy * counting mode PMCs use a per-pmc value that is 1279147191Sjkoshy * inherited across descendants. 1280147191Sjkoshy */ 1281147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1282147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1283147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1284147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval; 1285147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1286147191Sjkoshy } else { 1287147191Sjkoshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1288147191Sjkoshy ("[pmc,%d] illegal mode=%d", __LINE__, 1289147191Sjkoshy PMC_TO_MODE(pm))); 1290147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1291147191Sjkoshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1292147191Sjkoshy pm->pm_gv.pm_savedvalue; 1293147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1294147191Sjkoshy } 1295145256Sjkoshy 1296147191Sjkoshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1297145256Sjkoshy 1298184802Sjkoshy pcd->pcd_write_pmc(cpu, adjri, newvalue); 1299184802Sjkoshy pcd->pcd_start_pmc(cpu, adjri); 1300147191Sjkoshy } 1301145256Sjkoshy 1302147191Sjkoshy /* 1303147191Sjkoshy * perform any other architecture/cpu dependent thread 1304147191Sjkoshy * switch-in actions. 1305147191Sjkoshy */ 1306145256Sjkoshy 1307147191Sjkoshy (void) (*md->pmd_switch_in)(pc, pp); 1308145256Sjkoshy 1309147191Sjkoshy critical_exit(); 1310145256Sjkoshy 1311147191Sjkoshy} 1312145256Sjkoshy 1313147191Sjkoshy/* 1314147191Sjkoshy * Thread context switch OUT. 1315147191Sjkoshy */ 1316145256Sjkoshy 1317147191Sjkoshystatic void 1318147191Sjkoshypmc_process_csw_out(struct thread *td) 1319147191Sjkoshy{ 1320147191Sjkoshy int cpu; 1321184802Sjkoshy int64_t tmp; 1322147191Sjkoshy struct pmc *pm; 1323147191Sjkoshy struct proc *p; 1324184802Sjkoshy enum pmc_mode mode; 1325147191Sjkoshy struct pmc_cpu *pc; 1326184802Sjkoshy pmc_value_t newvalue; 1327184802Sjkoshy unsigned int adjri, ri; 1328147191Sjkoshy struct pmc_process *pp; 1329184802Sjkoshy struct pmc_classdep *pcd; 1330145256Sjkoshy 1331184802Sjkoshy 1332147191Sjkoshy /* 1333147191Sjkoshy * Locate our process descriptor; this may be NULL if 1334147191Sjkoshy * this process is exiting and we have already removed 1335147191Sjkoshy * the process from the target process table. 1336147191Sjkoshy * 1337147191Sjkoshy * Note that due to kernel preemption, multiple 1338147191Sjkoshy * context switches may happen while the process is 1339147191Sjkoshy * exiting. 1340147191Sjkoshy * 1341147191Sjkoshy * Note also that if the target process cannot be 1342147191Sjkoshy * found we still need to deconfigure any PMCs that 1343147191Sjkoshy * are currently running on hardware. 1344147191Sjkoshy */ 1345145256Sjkoshy 1346147191Sjkoshy p = td->td_proc; 1347147191Sjkoshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1348145256Sjkoshy 1349147191Sjkoshy /* 1350147191Sjkoshy * save PMCs 1351147191Sjkoshy */ 1352145256Sjkoshy 1353147191Sjkoshy critical_enter(); 1354145774Sjkoshy 1355147191Sjkoshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1356145256Sjkoshy 1357147191Sjkoshy PMCDBG(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1358147191Sjkoshy p->p_pid, p->p_comm, pp); 1359145615Sjkoshy 1360183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1361147191Sjkoshy ("[pmc,%d wierd CPU id %d", __LINE__, cpu)); 1362145615Sjkoshy 1363147191Sjkoshy pc = pmc_pcpu[cpu]; 1364145615Sjkoshy 1365147191Sjkoshy /* 1366147191Sjkoshy * When a PMC gets unlinked from a target PMC, it will 1367147191Sjkoshy * be removed from the target's pp_pmc[] array. 1368147191Sjkoshy * 1369147191Sjkoshy * However, on a MP system, the target could have been 1370147191Sjkoshy * executing on another CPU at the time of the unlink. 1371147191Sjkoshy * So, at context switch OUT time, we need to look at 1372147191Sjkoshy * the hardware to determine if a PMC is scheduled on 1373147191Sjkoshy * it. 1374147191Sjkoshy */ 1375145256Sjkoshy 1376147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1377145256Sjkoshy 1378184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1379184802Sjkoshy pm = NULL; 1380184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 1381145256Sjkoshy 1382147191Sjkoshy if (pm == NULL) /* nothing at this row index */ 1383147191Sjkoshy continue; 1384145256Sjkoshy 1385147191Sjkoshy mode = PMC_TO_MODE(pm); 1386147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1387147191Sjkoshy continue; /* not a process virtual PMC */ 1388145774Sjkoshy 1389147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1390147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1391147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1392145256Sjkoshy 1393147191Sjkoshy /* Stop hardware if not already stopped */ 1394147867Sjkoshy if (pm->pm_stalled == 0) 1395184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 1396147191Sjkoshy 1397147191Sjkoshy /* reduce this PMC's runcount */ 1398208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount, 1); 1399147191Sjkoshy 1400145256Sjkoshy /* 1401147191Sjkoshy * If this PMC is associated with this process, 1402147191Sjkoshy * save the reading. 1403145256Sjkoshy */ 1404145256Sjkoshy 1405147191Sjkoshy if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) { 1406147191Sjkoshy 1407147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1408147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1409147191Sjkoshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1410147191Sjkoshy 1411147191Sjkoshy KASSERT(pp->pp_refcnt > 0, 1412147191Sjkoshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1413147191Sjkoshy pp->pp_refcnt)); 1414147191Sjkoshy 1415184802Sjkoshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 1416147191Sjkoshy 1417147191Sjkoshy tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1418147191Sjkoshy 1419199972Semaste PMCDBG(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd", cpu, ri, 1420147191Sjkoshy tmp); 1421147191Sjkoshy 1422147191Sjkoshy if (mode == PMC_MODE_TS) { 1423147191Sjkoshy 1424147191Sjkoshy /* 1425147191Sjkoshy * For sampling process-virtual PMCs, 1426147191Sjkoshy * we expect the count to be 1427147191Sjkoshy * decreasing as the 'value' 1428147191Sjkoshy * programmed into the PMC is the 1429147191Sjkoshy * number of events to be seen till 1430147191Sjkoshy * the next sampling interrupt. 1431147191Sjkoshy */ 1432147191Sjkoshy if (tmp < 0) 1433147191Sjkoshy tmp += pm->pm_sc.pm_reloadcount; 1434147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1435147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval -= tmp; 1436147191Sjkoshy if ((int64_t) pp->pp_pmcs[ri].pp_pmcval < 0) 1437147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += 1438147191Sjkoshy pm->pm_sc.pm_reloadcount; 1439147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1440147191Sjkoshy 1441147191Sjkoshy } else { 1442147191Sjkoshy 1443147191Sjkoshy /* 1444147191Sjkoshy * For counting process-virtual PMCs, 1445147191Sjkoshy * we expect the count to be 1446147191Sjkoshy * increasing monotonically, modulo a 64 1447147191Sjkoshy * bit wraparound. 1448147191Sjkoshy */ 1449147191Sjkoshy KASSERT((int64_t) tmp >= 0, 1450147191Sjkoshy ("[pmc,%d] negative increment cpu=%d " 1451147191Sjkoshy "ri=%d newvalue=%jx saved=%jx " 1452147191Sjkoshy "incr=%jx", __LINE__, cpu, ri, 1453147191Sjkoshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1454147191Sjkoshy 1455147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1456147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 1457147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1458147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1459147191Sjkoshy 1460147191Sjkoshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1461147191Sjkoshy pmclog_process_proccsw(pm, pp, tmp); 1462147191Sjkoshy } 1463145256Sjkoshy } 1464145256Sjkoshy 1465147191Sjkoshy /* mark hardware as free */ 1466184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 1467145256Sjkoshy } 1468145256Sjkoshy 1469145256Sjkoshy /* 1470147191Sjkoshy * perform any other architecture/cpu dependent thread 1471147191Sjkoshy * switch out functions. 1472147191Sjkoshy */ 1473147191Sjkoshy 1474147191Sjkoshy (void) (*md->pmd_switch_out)(pc, pp); 1475147191Sjkoshy 1476147191Sjkoshy critical_exit(); 1477147191Sjkoshy} 1478147191Sjkoshy 1479147191Sjkoshy/* 1480157144Sjkoshy * A mapping change for a process. 1481157144Sjkoshy */ 1482157144Sjkoshy 1483157144Sjkoshystatic void 1484157144Sjkoshypmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm) 1485157144Sjkoshy{ 1486157144Sjkoshy int ri; 1487157144Sjkoshy pid_t pid; 1488157144Sjkoshy char *fullpath, *freepath; 1489157144Sjkoshy const struct pmc *pm; 1490157144Sjkoshy struct pmc_owner *po; 1491157144Sjkoshy const struct pmc_process *pp; 1492157144Sjkoshy 1493157144Sjkoshy freepath = fullpath = NULL; 1494157144Sjkoshy pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath); 1495157144Sjkoshy 1496157144Sjkoshy pid = td->td_proc->p_pid; 1497157144Sjkoshy 1498157144Sjkoshy /* Inform owners of all system-wide sampling PMCs. */ 1499157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1500157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1501157144Sjkoshy pmclog_process_map_in(po, pid, pkm->pm_address, fullpath); 1502157144Sjkoshy 1503157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1504157144Sjkoshy goto done; 1505157144Sjkoshy 1506157144Sjkoshy /* 1507157144Sjkoshy * Inform sampling PMC owners tracking this process. 1508157144Sjkoshy */ 1509157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1510157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1511157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1512157144Sjkoshy pmclog_process_map_in(pm->pm_owner, 1513157144Sjkoshy pid, pkm->pm_address, fullpath); 1514157144Sjkoshy 1515157144Sjkoshy done: 1516157144Sjkoshy if (freepath) 1517184205Sdes free(freepath, M_TEMP); 1518157144Sjkoshy} 1519157144Sjkoshy 1520157144Sjkoshy 1521157144Sjkoshy/* 1522157144Sjkoshy * Log an munmap request. 1523157144Sjkoshy */ 1524157144Sjkoshy 1525157144Sjkoshystatic void 1526157144Sjkoshypmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm) 1527157144Sjkoshy{ 1528157144Sjkoshy int ri; 1529157144Sjkoshy pid_t pid; 1530157144Sjkoshy struct pmc_owner *po; 1531157144Sjkoshy const struct pmc *pm; 1532157144Sjkoshy const struct pmc_process *pp; 1533157144Sjkoshy 1534157144Sjkoshy pid = td->td_proc->p_pid; 1535157144Sjkoshy 1536157144Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1537157144Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1538157144Sjkoshy pmclog_process_map_out(po, pid, pkm->pm_address, 1539157144Sjkoshy pkm->pm_address + pkm->pm_size); 1540157144Sjkoshy 1541157144Sjkoshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 1542157144Sjkoshy return; 1543157144Sjkoshy 1544157144Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1545157144Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 1546157144Sjkoshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1547157651Sjkoshy pmclog_process_map_out(pm->pm_owner, pid, 1548157651Sjkoshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 1549157144Sjkoshy} 1550157144Sjkoshy 1551157144Sjkoshy/* 1552174395Sjkoshy * Log mapping information about the kernel. 1553174395Sjkoshy */ 1554174395Sjkoshy 1555174395Sjkoshystatic void 1556174395Sjkoshypmc_log_kernel_mappings(struct pmc *pm) 1557174395Sjkoshy{ 1558174395Sjkoshy struct pmc_owner *po; 1559174395Sjkoshy struct pmckern_map_in *km, *kmbase; 1560174395Sjkoshy 1561174395Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1562174395Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 1563174395Sjkoshy ("[pmc,%d] non-sampling PMC (%p) desires mapping information", 1564174395Sjkoshy __LINE__, (void *) pm)); 1565174395Sjkoshy 1566174395Sjkoshy po = pm->pm_owner; 1567174395Sjkoshy 1568174395Sjkoshy if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE) 1569174395Sjkoshy return; 1570174395Sjkoshy 1571174395Sjkoshy /* 1572174395Sjkoshy * Log the current set of kernel modules. 1573174395Sjkoshy */ 1574174395Sjkoshy kmbase = linker_hwpmc_list_objects(); 1575174395Sjkoshy for (km = kmbase; km->pm_file != NULL; km++) { 1576174395Sjkoshy PMCDBG(LOG,REG,1,"%s %p", (char *) km->pm_file, 1577174395Sjkoshy (void *) km->pm_address); 1578174395Sjkoshy pmclog_process_map_in(po, (pid_t) -1, km->pm_address, 1579174395Sjkoshy km->pm_file); 1580174395Sjkoshy } 1581184205Sdes free(kmbase, M_LINKER); 1582174395Sjkoshy 1583174395Sjkoshy po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE; 1584174395Sjkoshy} 1585174395Sjkoshy 1586174395Sjkoshy/* 1587174395Sjkoshy * Log the mappings for a single process. 1588174395Sjkoshy */ 1589174395Sjkoshy 1590174395Sjkoshystatic void 1591174395Sjkoshypmc_log_process_mappings(struct pmc_owner *po, struct proc *p) 1592174395Sjkoshy{ 1593201021Sjkoshy vm_map_t map; 1594201021Sjkoshy struct vnode *vp; 1595201021Sjkoshy struct vmspace *vm; 1596201021Sjkoshy vm_map_entry_t entry; 1597201021Sjkoshy vm_offset_t last_end; 1598201021Sjkoshy u_int last_timestamp; 1599201021Sjkoshy struct vnode *last_vp; 1600201021Sjkoshy vm_offset_t start_addr; 1601201021Sjkoshy vm_object_t obj, lobj, tobj; 1602201021Sjkoshy char *fullpath, *freepath; 1603201021Sjkoshy 1604201021Sjkoshy last_vp = NULL; 1605201021Sjkoshy last_end = (vm_offset_t) 0; 1606201021Sjkoshy fullpath = freepath = NULL; 1607201021Sjkoshy 1608201021Sjkoshy if ((vm = vmspace_acquire_ref(p)) == NULL) 1609201021Sjkoshy return; 1610201021Sjkoshy 1611201021Sjkoshy map = &vm->vm_map; 1612201021Sjkoshy vm_map_lock_read(map); 1613201021Sjkoshy 1614201021Sjkoshy for (entry = map->header.next; entry != &map->header; entry = entry->next) { 1615201021Sjkoshy 1616201021Sjkoshy if (entry == NULL) { 1617201021Sjkoshy PMCDBG(LOG,OPS,2, "hwpmc: vm_map entry unexpectedly " 1618201021Sjkoshy "NULL! pid=%d vm_map=%p\n", p->p_pid, map); 1619201021Sjkoshy break; 1620201021Sjkoshy } 1621201021Sjkoshy 1622201021Sjkoshy /* 1623201021Sjkoshy * We only care about executable map entries. 1624201021Sjkoshy */ 1625201021Sjkoshy if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 1626201021Sjkoshy !(entry->protection & VM_PROT_EXECUTE) || 1627201021Sjkoshy (entry->object.vm_object == NULL)) { 1628201021Sjkoshy continue; 1629201021Sjkoshy } 1630201021Sjkoshy 1631201021Sjkoshy obj = entry->object.vm_object; 1632251423Salc VM_OBJECT_RLOCK(obj); 1633201021Sjkoshy 1634201021Sjkoshy /* 1635201021Sjkoshy * Walk the backing_object list to find the base 1636201021Sjkoshy * (non-shadowed) vm_object. 1637201021Sjkoshy */ 1638201021Sjkoshy for (lobj = tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 1639201021Sjkoshy if (tobj != obj) 1640251423Salc VM_OBJECT_RLOCK(tobj); 1641201021Sjkoshy if (lobj != obj) 1642251423Salc VM_OBJECT_RUNLOCK(lobj); 1643201021Sjkoshy lobj = tobj; 1644201021Sjkoshy } 1645201021Sjkoshy 1646201021Sjkoshy /* 1647201021Sjkoshy * At this point lobj is the base vm_object and it is locked. 1648201021Sjkoshy */ 1649201021Sjkoshy if (lobj == NULL) { 1650201021Sjkoshy PMCDBG(LOG,OPS,2, "hwpmc: lobj unexpectedly NULL! pid=%d " 1651201021Sjkoshy "vm_map=%p vm_obj=%p\n", p->p_pid, map, obj); 1652251423Salc VM_OBJECT_RUNLOCK(obj); 1653201021Sjkoshy continue; 1654201021Sjkoshy } 1655201021Sjkoshy 1656201021Sjkoshy if (lobj->type != OBJT_VNODE || lobj->handle == NULL) { 1657201021Sjkoshy if (lobj != obj) 1658251423Salc VM_OBJECT_RUNLOCK(lobj); 1659251423Salc VM_OBJECT_RUNLOCK(obj); 1660201021Sjkoshy continue; 1661201021Sjkoshy } 1662201021Sjkoshy 1663201021Sjkoshy /* 1664201021Sjkoshy * Skip contiguous regions that point to the same 1665201021Sjkoshy * vnode, so we don't emit redundant MAP-IN 1666201021Sjkoshy * directives. 1667201021Sjkoshy */ 1668201021Sjkoshy if (entry->start == last_end && lobj->handle == last_vp) { 1669201021Sjkoshy last_end = entry->end; 1670201021Sjkoshy if (lobj != obj) 1671251423Salc VM_OBJECT_RUNLOCK(lobj); 1672251423Salc VM_OBJECT_RUNLOCK(obj); 1673201021Sjkoshy continue; 1674201021Sjkoshy } 1675201021Sjkoshy 1676201021Sjkoshy /* 1677201021Sjkoshy * We don't want to keep the proc's vm_map or this 1678201021Sjkoshy * vm_object locked while we walk the pathname, since 1679201021Sjkoshy * vn_fullpath() can sleep. However, if we drop the 1680201021Sjkoshy * lock, it's possible for concurrent activity to 1681201021Sjkoshy * modify the vm_map list. To protect against this, 1682201021Sjkoshy * we save the vm_map timestamp before we release the 1683201021Sjkoshy * lock, and check it after we reacquire the lock 1684201021Sjkoshy * below. 1685201021Sjkoshy */ 1686201021Sjkoshy start_addr = entry->start; 1687201021Sjkoshy last_end = entry->end; 1688201021Sjkoshy last_timestamp = map->timestamp; 1689201021Sjkoshy vm_map_unlock_read(map); 1690201021Sjkoshy 1691201021Sjkoshy vp = lobj->handle; 1692201021Sjkoshy vref(vp); 1693201021Sjkoshy if (lobj != obj) 1694251423Salc VM_OBJECT_RUNLOCK(lobj); 1695201021Sjkoshy 1696251423Salc VM_OBJECT_RUNLOCK(obj); 1697201021Sjkoshy 1698201021Sjkoshy freepath = NULL; 1699201021Sjkoshy pmc_getfilename(vp, &fullpath, &freepath); 1700201021Sjkoshy last_vp = vp; 1701201151Sjkoshy 1702201021Sjkoshy vrele(vp); 1703201151Sjkoshy 1704201021Sjkoshy vp = NULL; 1705201021Sjkoshy pmclog_process_map_in(po, p->p_pid, start_addr, fullpath); 1706201021Sjkoshy if (freepath) 1707201021Sjkoshy free(freepath, M_TEMP); 1708201021Sjkoshy 1709201021Sjkoshy vm_map_lock_read(map); 1710201021Sjkoshy 1711201021Sjkoshy /* 1712201021Sjkoshy * If our saved timestamp doesn't match, this means 1713201021Sjkoshy * that the vm_map was modified out from under us and 1714201021Sjkoshy * we can't trust our current "entry" pointer. Do a 1715201021Sjkoshy * new lookup for this entry. If there is no entry 1716201021Sjkoshy * for this address range, vm_map_lookup_entry() will 1717201021Sjkoshy * return the previous one, so we always want to go to 1718201021Sjkoshy * entry->next on the next loop iteration. 1719201021Sjkoshy * 1720201021Sjkoshy * There is an edge condition here that can occur if 1721201021Sjkoshy * there is no entry at or before this address. In 1722201021Sjkoshy * this situation, vm_map_lookup_entry returns 1723201021Sjkoshy * &map->header, which would cause our loop to abort 1724201021Sjkoshy * without processing the rest of the map. However, 1725201021Sjkoshy * in practice this will never happen for process 1726201021Sjkoshy * vm_map. This is because the executable's text 1727201021Sjkoshy * segment is the first mapping in the proc's address 1728201021Sjkoshy * space, and this mapping is never removed until the 1729201021Sjkoshy * process exits, so there will always be a non-header 1730201021Sjkoshy * entry at or before the requested address for 1731201021Sjkoshy * vm_map_lookup_entry to return. 1732201021Sjkoshy */ 1733201021Sjkoshy if (map->timestamp != last_timestamp) 1734201021Sjkoshy vm_map_lookup_entry(map, last_end - 1, &entry); 1735201021Sjkoshy } 1736201021Sjkoshy 1737201021Sjkoshy vm_map_unlock_read(map); 1738201021Sjkoshy vmspace_free(vm); 1739201021Sjkoshy return; 1740174395Sjkoshy} 1741174395Sjkoshy 1742174395Sjkoshy/* 1743174395Sjkoshy * Log mappings for all processes in the system. 1744174395Sjkoshy */ 1745174395Sjkoshy 1746174395Sjkoshystatic void 1747174395Sjkoshypmc_log_all_process_mappings(struct pmc_owner *po) 1748174395Sjkoshy{ 1749174395Sjkoshy struct proc *p, *top; 1750174395Sjkoshy 1751174395Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1752174395Sjkoshy 1753174395Sjkoshy if ((p = pfind(1)) == NULL) 1754174395Sjkoshy panic("[pmc,%d] Cannot find init", __LINE__); 1755174395Sjkoshy 1756174395Sjkoshy PROC_UNLOCK(p); 1757174395Sjkoshy 1758174395Sjkoshy sx_slock(&proctree_lock); 1759174395Sjkoshy 1760174395Sjkoshy top = p; 1761174395Sjkoshy 1762174395Sjkoshy for (;;) { 1763174395Sjkoshy pmc_log_process_mappings(po, p); 1764174395Sjkoshy if (!LIST_EMPTY(&p->p_children)) 1765174395Sjkoshy p = LIST_FIRST(&p->p_children); 1766174395Sjkoshy else for (;;) { 1767174395Sjkoshy if (p == top) 1768174395Sjkoshy goto done; 1769174395Sjkoshy if (LIST_NEXT(p, p_sibling)) { 1770174395Sjkoshy p = LIST_NEXT(p, p_sibling); 1771174395Sjkoshy break; 1772174395Sjkoshy } 1773174395Sjkoshy p = p->p_pptr; 1774174395Sjkoshy } 1775174395Sjkoshy } 1776174395Sjkoshy done: 1777174395Sjkoshy sx_sunlock(&proctree_lock); 1778174395Sjkoshy} 1779174395Sjkoshy 1780174395Sjkoshy/* 1781147191Sjkoshy * The 'hook' invoked from the kernel proper 1782147191Sjkoshy */ 1783147191Sjkoshy 1784147191Sjkoshy 1785153110Sru#ifdef DEBUG 1786147191Sjkoshyconst char *pmc_hooknames[] = { 1787157144Sjkoshy /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */ 1788147191Sjkoshy "", 1789147191Sjkoshy "EXEC", 1790147191Sjkoshy "CSW-IN", 1791147191Sjkoshy "CSW-OUT", 1792157144Sjkoshy "SAMPLE", 1793254813Smarkj "UNUSED1", 1794254813Smarkj "UNUSED2", 1795157144Sjkoshy "MMAP", 1796174395Sjkoshy "MUNMAP", 1797233628Sfabient "CALLCHAIN-NMI", 1798233628Sfabient "CALLCHAIN-SOFT", 1799233628Sfabient "SOFTSAMPLING" 1800147191Sjkoshy}; 1801147191Sjkoshy#endif 1802147191Sjkoshy 1803147191Sjkoshystatic int 1804147191Sjkoshypmc_hook_handler(struct thread *td, int function, void *arg) 1805147191Sjkoshy{ 1806147191Sjkoshy 1807147191Sjkoshy PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1808147191Sjkoshy pmc_hooknames[function], arg); 1809147191Sjkoshy 1810147191Sjkoshy switch (function) 1811147191Sjkoshy { 1812147191Sjkoshy 1813147191Sjkoshy /* 1814145256Sjkoshy * Process exec() 1815145256Sjkoshy */ 1816145256Sjkoshy 1817145256Sjkoshy case PMC_FN_PROCESS_EXEC: 1818145256Sjkoshy { 1819147191Sjkoshy char *fullpath, *freepath; 1820145256Sjkoshy unsigned int ri; 1821147191Sjkoshy int is_using_hwpmcs; 1822145256Sjkoshy struct pmc *pm; 1823145256Sjkoshy struct proc *p; 1824145256Sjkoshy struct pmc_owner *po; 1825145256Sjkoshy struct pmc_process *pp; 1826147708Sjkoshy struct pmckern_procexec *pk; 1827145256Sjkoshy 1828145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 1829145256Sjkoshy 1830147191Sjkoshy p = td->td_proc; 1831147708Sjkoshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1832147191Sjkoshy 1833147708Sjkoshy pk = (struct pmckern_procexec *) arg; 1834147708Sjkoshy 1835147191Sjkoshy /* Inform owners of SS mode PMCs of the exec event. */ 1836147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1837147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1838147708Sjkoshy pmclog_process_procexec(po, PMC_ID_INVALID, 1839147708Sjkoshy p->p_pid, pk->pm_entryaddr, fullpath); 1840147191Sjkoshy 1841147191Sjkoshy PROC_LOCK(p); 1842147191Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1843147191Sjkoshy PROC_UNLOCK(p); 1844147191Sjkoshy 1845147191Sjkoshy if (!is_using_hwpmcs) { 1846147191Sjkoshy if (freepath) 1847184205Sdes free(freepath, M_TEMP); 1848147191Sjkoshy break; 1849147191Sjkoshy } 1850147191Sjkoshy 1851145256Sjkoshy /* 1852145256Sjkoshy * PMCs are not inherited across an exec(): remove any 1853145256Sjkoshy * PMCs that this process is the owner of. 1854145256Sjkoshy */ 1855145256Sjkoshy 1856145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1857145256Sjkoshy pmc_remove_owner(po); 1858147191Sjkoshy pmc_destroy_owner_descriptor(po); 1859145256Sjkoshy } 1860145256Sjkoshy 1861145256Sjkoshy /* 1862154483Sjkoshy * If the process being exec'ed is not the target of any 1863154483Sjkoshy * PMC, we are done. 1864145256Sjkoshy */ 1865154483Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 1866154483Sjkoshy if (freepath) 1867184205Sdes free(freepath, M_TEMP); 1868145256Sjkoshy break; 1869154483Sjkoshy } 1870145256Sjkoshy 1871147191Sjkoshy /* 1872147191Sjkoshy * Log the exec event to all monitoring owners. Skip 1873147191Sjkoshy * owners who have already recieved the event because 1874154483Sjkoshy * they had system sampling PMCs active. 1875147191Sjkoshy */ 1876147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1877147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1878147191Sjkoshy po = pm->pm_owner; 1879147191Sjkoshy if (po->po_sscount == 0 && 1880147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 1881147708Sjkoshy pmclog_process_procexec(po, pm->pm_id, 1882147708Sjkoshy p->p_pid, pk->pm_entryaddr, 1883147191Sjkoshy fullpath); 1884147191Sjkoshy } 1885147191Sjkoshy 1886147191Sjkoshy if (freepath) 1887184205Sdes free(freepath, M_TEMP); 1888147191Sjkoshy 1889145256Sjkoshy 1890145256Sjkoshy PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 1891147708Sjkoshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1892145256Sjkoshy 1893147708Sjkoshy if (pk->pm_credentialschanged == 0) /* no change */ 1894145256Sjkoshy break; 1895145256Sjkoshy 1896145256Sjkoshy /* 1897145256Sjkoshy * If the newly exec()'ed process has a different credential 1898145256Sjkoshy * than before, allow it to be the target of a PMC only if 1899145256Sjkoshy * the PMC's owner has sufficient priviledge. 1900145256Sjkoshy */ 1901145256Sjkoshy 1902145256Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 1903145256Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1904145256Sjkoshy if (pmc_can_attach(pm, td->td_proc) != 0) 1905145256Sjkoshy pmc_detach_one_process(td->td_proc, 1906145256Sjkoshy pm, PMC_FLAG_NONE); 1907145256Sjkoshy 1908198343Sfabient KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1909145256Sjkoshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1910145256Sjkoshy pp->pp_refcnt, pp)); 1911145256Sjkoshy 1912145256Sjkoshy /* 1913145256Sjkoshy * If this process is no longer the target of any 1914145256Sjkoshy * PMCs, we can remove the process entry and free 1915145256Sjkoshy * up space. 1916145256Sjkoshy */ 1917145256Sjkoshy 1918145256Sjkoshy if (pp->pp_refcnt == 0) { 1919145256Sjkoshy pmc_remove_process_descriptor(pp); 1920184205Sdes free(pp, M_PMC); 1921147191Sjkoshy break; 1922145256Sjkoshy } 1923145256Sjkoshy 1924145256Sjkoshy } 1925145256Sjkoshy break; 1926145256Sjkoshy 1927145256Sjkoshy case PMC_FN_CSW_IN: 1928147191Sjkoshy pmc_process_csw_in(td); 1929147191Sjkoshy break; 1930145256Sjkoshy 1931147191Sjkoshy case PMC_FN_CSW_OUT: 1932147191Sjkoshy pmc_process_csw_out(td); 1933147191Sjkoshy break; 1934145256Sjkoshy 1935145256Sjkoshy /* 1936147191Sjkoshy * Process accumulated PC samples. 1937147191Sjkoshy * 1938147191Sjkoshy * This function is expected to be called by hardclock() for 1939147191Sjkoshy * each CPU that has accumulated PC samples. 1940147191Sjkoshy * 1941147191Sjkoshy * This function is to be executed on the CPU whose samples 1942147191Sjkoshy * are being processed. 1943145256Sjkoshy */ 1944147191Sjkoshy case PMC_FN_DO_SAMPLES: 1945145256Sjkoshy 1946145256Sjkoshy /* 1947147191Sjkoshy * Clear the cpu specific bit in the CPU mask before 1948147191Sjkoshy * do the rest of the processing. If the NMI handler 1949147191Sjkoshy * gets invoked after the "atomic_clear_int()" call 1950147191Sjkoshy * below but before "pmc_process_samples()" gets 1951147191Sjkoshy * around to processing the interrupt, then we will 1952147191Sjkoshy * come back here at the next hardclock() tick (and 1953147191Sjkoshy * may find nothing to do if "pmc_process_samples()" 1954147191Sjkoshy * had already processed the interrupt). We don't 1955147191Sjkoshy * lose the interrupt sample. 1956145256Sjkoshy */ 1957222813Sattilio CPU_CLR_ATOMIC(PCPU_GET(cpuid), &pmc_cpumask); 1958233628Sfabient pmc_process_samples(PCPU_GET(cpuid), PMC_HR); 1959233628Sfabient pmc_process_samples(PCPU_GET(cpuid), PMC_SR); 1960147191Sjkoshy break; 1961145256Sjkoshy 1962157144Sjkoshy case PMC_FN_MMAP: 1963157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1964157144Sjkoshy pmc_process_mmap(td, (struct pmckern_map_in *) arg); 1965157144Sjkoshy break; 1966157144Sjkoshy 1967157144Sjkoshy case PMC_FN_MUNMAP: 1968157144Sjkoshy sx_assert(&pmc_sx, SX_LOCKED); 1969157144Sjkoshy pmc_process_munmap(td, (struct pmckern_map_out *) arg); 1970157144Sjkoshy break; 1971157144Sjkoshy 1972174395Sjkoshy case PMC_FN_USER_CALLCHAIN: 1973174395Sjkoshy /* 1974174395Sjkoshy * Record a call chain. 1975174395Sjkoshy */ 1976186037Sjkoshy KASSERT(td == curthread, ("[pmc,%d] td != curthread", 1977186037Sjkoshy __LINE__)); 1978233628Sfabient 1979233628Sfabient pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_HR, 1980174395Sjkoshy (struct trapframe *) arg); 1981186037Sjkoshy td->td_pflags &= ~TDP_CALLCHAIN; 1982174395Sjkoshy break; 1983174395Sjkoshy 1984233628Sfabient case PMC_FN_USER_CALLCHAIN_SOFT: 1985233628Sfabient /* 1986233628Sfabient * Record a call chain. 1987233628Sfabient */ 1988233628Sfabient KASSERT(td == curthread, ("[pmc,%d] td != curthread", 1989233628Sfabient __LINE__)); 1990233628Sfabient pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_SR, 1991233628Sfabient (struct trapframe *) arg); 1992233628Sfabient td->td_pflags &= ~TDP_CALLCHAIN; 1993233628Sfabient break; 1994233628Sfabient 1995233628Sfabient case PMC_FN_SOFT_SAMPLING: 1996233628Sfabient /* 1997233628Sfabient * Call soft PMC sampling intr. 1998233628Sfabient */ 1999233628Sfabient pmc_soft_intr((struct pmckern_soft *) arg); 2000233628Sfabient break; 2001233628Sfabient 2002145256Sjkoshy default: 2003153110Sru#ifdef DEBUG 2004145256Sjkoshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 2005145256Sjkoshy#endif 2006145256Sjkoshy break; 2007145256Sjkoshy 2008145256Sjkoshy } 2009145256Sjkoshy 2010145256Sjkoshy return 0; 2011145256Sjkoshy} 2012145256Sjkoshy 2013145256Sjkoshy/* 2014145256Sjkoshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 2015145256Sjkoshy */ 2016145256Sjkoshy 2017145256Sjkoshystatic struct pmc_owner * 2018145256Sjkoshypmc_allocate_owner_descriptor(struct proc *p) 2019145256Sjkoshy{ 2020145256Sjkoshy uint32_t hindex; 2021145256Sjkoshy struct pmc_owner *po; 2022145256Sjkoshy struct pmc_ownerhash *poh; 2023145256Sjkoshy 2024145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2025145256Sjkoshy poh = &pmc_ownerhash[hindex]; 2026145256Sjkoshy 2027145256Sjkoshy /* allocate space for N pointers and one descriptor struct */ 2028184802Sjkoshy po = malloc(sizeof(struct pmc_owner), M_PMC, M_WAITOK|M_ZERO); 2029145256Sjkoshy po->po_owner = p; 2030145256Sjkoshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 2031145256Sjkoshy 2032147191Sjkoshy TAILQ_INIT(&po->po_logbuffers); 2033168856Sjkoshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN); 2034147191Sjkoshy 2035145256Sjkoshy PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 2036145256Sjkoshy p, p->p_pid, p->p_comm, po); 2037145256Sjkoshy 2038145256Sjkoshy return po; 2039145256Sjkoshy} 2040145256Sjkoshy 2041147191Sjkoshystatic void 2042147191Sjkoshypmc_destroy_owner_descriptor(struct pmc_owner *po) 2043147191Sjkoshy{ 2044147191Sjkoshy 2045147191Sjkoshy PMCDBG(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 2046147191Sjkoshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 2047147191Sjkoshy 2048147191Sjkoshy mtx_destroy(&po->po_mtx); 2049184205Sdes free(po, M_PMC); 2050147191Sjkoshy} 2051147191Sjkoshy 2052145256Sjkoshy/* 2053145256Sjkoshy * find the descriptor corresponding to process 'p', adding or removing it 2054145256Sjkoshy * as specified by 'mode'. 2055145256Sjkoshy */ 2056145256Sjkoshy 2057145256Sjkoshystatic struct pmc_process * 2058145256Sjkoshypmc_find_process_descriptor(struct proc *p, uint32_t mode) 2059145256Sjkoshy{ 2060145256Sjkoshy uint32_t hindex; 2061145256Sjkoshy struct pmc_process *pp, *ppnew; 2062145256Sjkoshy struct pmc_processhash *pph; 2063145256Sjkoshy 2064145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 2065145256Sjkoshy pph = &pmc_processhash[hindex]; 2066145256Sjkoshy 2067145256Sjkoshy ppnew = NULL; 2068145256Sjkoshy 2069145256Sjkoshy /* 2070145256Sjkoshy * Pre-allocate memory in the FIND_ALLOCATE case since we 2071145256Sjkoshy * cannot call malloc(9) once we hold a spin lock. 2072145256Sjkoshy */ 2073184802Sjkoshy if (mode & PMC_FLAG_ALLOCATE) 2074184214Sdes ppnew = malloc(sizeof(struct pmc_process) + md->pmd_npmc * 2075184802Sjkoshy sizeof(struct pmc_targetstate), M_PMC, M_WAITOK|M_ZERO); 2076145256Sjkoshy 2077145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 2078145256Sjkoshy LIST_FOREACH(pp, pph, pp_next) 2079145256Sjkoshy if (pp->pp_proc == p) 2080145256Sjkoshy break; 2081145256Sjkoshy 2082145256Sjkoshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 2083145256Sjkoshy LIST_REMOVE(pp, pp_next); 2084145256Sjkoshy 2085145256Sjkoshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 2086145256Sjkoshy ppnew != NULL) { 2087145256Sjkoshy ppnew->pp_proc = p; 2088145256Sjkoshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 2089145256Sjkoshy pp = ppnew; 2090145256Sjkoshy ppnew = NULL; 2091145256Sjkoshy } 2092145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 2093145256Sjkoshy 2094145256Sjkoshy if (pp != NULL && ppnew != NULL) 2095184205Sdes free(ppnew, M_PMC); 2096145256Sjkoshy 2097145256Sjkoshy return pp; 2098145256Sjkoshy} 2099145256Sjkoshy 2100145256Sjkoshy/* 2101145256Sjkoshy * remove a process descriptor from the process hash table. 2102145256Sjkoshy */ 2103145256Sjkoshy 2104145256Sjkoshystatic void 2105145256Sjkoshypmc_remove_process_descriptor(struct pmc_process *pp) 2106145256Sjkoshy{ 2107145256Sjkoshy KASSERT(pp->pp_refcnt == 0, 2108145256Sjkoshy ("[pmc,%d] Removing process descriptor %p with count %d", 2109145256Sjkoshy __LINE__, pp, pp->pp_refcnt)); 2110145256Sjkoshy 2111145256Sjkoshy mtx_lock_spin(&pmc_processhash_mtx); 2112145256Sjkoshy LIST_REMOVE(pp, pp_next); 2113145256Sjkoshy mtx_unlock_spin(&pmc_processhash_mtx); 2114145256Sjkoshy} 2115145256Sjkoshy 2116145256Sjkoshy 2117145256Sjkoshy/* 2118145256Sjkoshy * find an owner descriptor corresponding to proc 'p' 2119145256Sjkoshy */ 2120145256Sjkoshy 2121145256Sjkoshystatic struct pmc_owner * 2122145256Sjkoshypmc_find_owner_descriptor(struct proc *p) 2123145256Sjkoshy{ 2124145256Sjkoshy uint32_t hindex; 2125145256Sjkoshy struct pmc_owner *po; 2126145256Sjkoshy struct pmc_ownerhash *poh; 2127145256Sjkoshy 2128145256Sjkoshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2129145256Sjkoshy poh = &pmc_ownerhash[hindex]; 2130145256Sjkoshy 2131145256Sjkoshy po = NULL; 2132145256Sjkoshy LIST_FOREACH(po, poh, po_next) 2133145256Sjkoshy if (po->po_owner == p) 2134145256Sjkoshy break; 2135145256Sjkoshy 2136145256Sjkoshy PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 2137145256Sjkoshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 2138145256Sjkoshy 2139145256Sjkoshy return po; 2140145256Sjkoshy} 2141145256Sjkoshy 2142145256Sjkoshy/* 2143145256Sjkoshy * pmc_allocate_pmc_descriptor 2144145256Sjkoshy * 2145145256Sjkoshy * Allocate a pmc descriptor and initialize its 2146145256Sjkoshy * fields. 2147145256Sjkoshy */ 2148145256Sjkoshy 2149145256Sjkoshystatic struct pmc * 2150145256Sjkoshypmc_allocate_pmc_descriptor(void) 2151145256Sjkoshy{ 2152145256Sjkoshy struct pmc *pmc; 2153145256Sjkoshy 2154184802Sjkoshy pmc = malloc(sizeof(struct pmc), M_PMC, M_WAITOK|M_ZERO); 2155145256Sjkoshy 2156145256Sjkoshy PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 2157145256Sjkoshy 2158145256Sjkoshy return pmc; 2159145256Sjkoshy} 2160145256Sjkoshy 2161145256Sjkoshy/* 2162145256Sjkoshy * Destroy a pmc descriptor. 2163145256Sjkoshy */ 2164145256Sjkoshy 2165145256Sjkoshystatic void 2166145256Sjkoshypmc_destroy_pmc_descriptor(struct pmc *pm) 2167145256Sjkoshy{ 2168145256Sjkoshy (void) pm; 2169145256Sjkoshy 2170153110Sru#ifdef DEBUG 2171145256Sjkoshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 2172145256Sjkoshy pm->pm_state == PMC_STATE_FREE, 2173145256Sjkoshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 2174145256Sjkoshy KASSERT(LIST_EMPTY(&pm->pm_targets), 2175145256Sjkoshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 2176145256Sjkoshy KASSERT(pm->pm_owner == NULL, 2177145256Sjkoshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 2178145256Sjkoshy KASSERT(pm->pm_runcount == 0, 2179145256Sjkoshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 2180145256Sjkoshy pm->pm_runcount)); 2181145256Sjkoshy#endif 2182145256Sjkoshy} 2183145256Sjkoshy 2184147191Sjkoshystatic void 2185147191Sjkoshypmc_wait_for_pmc_idle(struct pmc *pm) 2186147191Sjkoshy{ 2187233628Sfabient#ifdef DEBUG 2188147191Sjkoshy volatile int maxloop; 2189147191Sjkoshy 2190183266Sjkoshy maxloop = 100 * pmc_cpu_max(); 2191147191Sjkoshy#endif 2192147191Sjkoshy /* 2193147191Sjkoshy * Loop (with a forced context switch) till the PMC's runcount 2194147191Sjkoshy * comes down to zero. 2195147191Sjkoshy */ 2196147191Sjkoshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 2197233628Sfabient#ifdef DEBUG 2198147191Sjkoshy maxloop--; 2199147191Sjkoshy KASSERT(maxloop > 0, 2200147191Sjkoshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 2201147191Sjkoshy "pmc to be free", __LINE__, 2202147191Sjkoshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 2203147191Sjkoshy#endif 2204147191Sjkoshy pmc_force_context_switch(); 2205147191Sjkoshy } 2206147191Sjkoshy} 2207147191Sjkoshy 2208145256Sjkoshy/* 2209145256Sjkoshy * This function does the following things: 2210145256Sjkoshy * 2211145256Sjkoshy * - detaches the PMC from hardware 2212145256Sjkoshy * - unlinks all target threads that were attached to it 2213145256Sjkoshy * - removes the PMC from its owner's list 2214145256Sjkoshy * - destroy's the PMC private mutex 2215145256Sjkoshy * 2216145256Sjkoshy * Once this function completes, the given pmc pointer can be safely 2217145256Sjkoshy * FREE'd by the caller. 2218145256Sjkoshy */ 2219145256Sjkoshy 2220145256Sjkoshystatic void 2221145256Sjkoshypmc_release_pmc_descriptor(struct pmc *pm) 2222145256Sjkoshy{ 2223145774Sjkoshy enum pmc_mode mode; 2224145256Sjkoshy struct pmc_hw *phw; 2225184802Sjkoshy u_int adjri, ri, cpu; 2226147191Sjkoshy struct pmc_owner *po; 2227184802Sjkoshy struct pmc_binding pb; 2228145256Sjkoshy struct pmc_process *pp; 2229184802Sjkoshy struct pmc_classdep *pcd; 2230145256Sjkoshy struct pmc_target *ptgt, *tmp; 2231145256Sjkoshy 2232145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2233145256Sjkoshy 2234145256Sjkoshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 2235145256Sjkoshy 2236145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2237184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2238145774Sjkoshy mode = PMC_TO_MODE(pm); 2239145256Sjkoshy 2240145256Sjkoshy PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 2241145774Sjkoshy mode); 2242145256Sjkoshy 2243145256Sjkoshy /* 2244145256Sjkoshy * First, we take the PMC off hardware. 2245145256Sjkoshy */ 2246145301Simp cpu = 0; 2247145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 2248145256Sjkoshy 2249145256Sjkoshy /* 2250145256Sjkoshy * A system mode PMC runs on a specific CPU. Switch 2251145256Sjkoshy * to this CPU and turn hardware off. 2252145256Sjkoshy */ 2253145256Sjkoshy pmc_save_cpu_binding(&pb); 2254145256Sjkoshy 2255145774Sjkoshy cpu = PMC_TO_CPU(pm); 2256145256Sjkoshy 2257147191Sjkoshy pmc_select_cpu(cpu); 2258145256Sjkoshy 2259147191Sjkoshy /* switch off non-stalled CPUs */ 2260147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 2261147867Sjkoshy pm->pm_stalled == 0) { 2262145256Sjkoshy 2263145256Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 2264145256Sjkoshy 2265145256Sjkoshy KASSERT(phw->phw_pmc == pm, 2266145256Sjkoshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 2267145256Sjkoshy __LINE__, ri, phw->phw_pmc, pm)); 2268145256Sjkoshy PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 2269145256Sjkoshy 2270145256Sjkoshy critical_enter(); 2271184802Sjkoshy pcd->pcd_stop_pmc(cpu, adjri); 2272145256Sjkoshy critical_exit(); 2273145256Sjkoshy } 2274145256Sjkoshy 2275145256Sjkoshy PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 2276145256Sjkoshy 2277145256Sjkoshy critical_enter(); 2278184802Sjkoshy pcd->pcd_config_pmc(cpu, adjri, NULL); 2279145256Sjkoshy critical_exit(); 2280145256Sjkoshy 2281147191Sjkoshy /* adjust the global and process count of SS mode PMCs */ 2282147191Sjkoshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 2283147191Sjkoshy po = pm->pm_owner; 2284147191Sjkoshy po->po_sscount--; 2285147191Sjkoshy if (po->po_sscount == 0) { 2286147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2287147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2288147191Sjkoshy } 2289147191Sjkoshy } 2290147191Sjkoshy 2291145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2292145256Sjkoshy 2293145256Sjkoshy pmc_restore_cpu_binding(&pb); 2294145256Sjkoshy 2295147191Sjkoshy /* 2296147191Sjkoshy * We could have references to this PMC structure in 2297147191Sjkoshy * the per-cpu sample queues. Wait for the queue to 2298147191Sjkoshy * drain. 2299147191Sjkoshy */ 2300147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2301147191Sjkoshy 2302145774Sjkoshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 2303145256Sjkoshy 2304145256Sjkoshy /* 2305145256Sjkoshy * A virtual PMC could be running on multiple CPUs at 2306145256Sjkoshy * a given instant. 2307145256Sjkoshy * 2308145256Sjkoshy * By marking its state as DELETED, we ensure that 2309145256Sjkoshy * this PMC is never further scheduled on hardware. 2310145256Sjkoshy * 2311145256Sjkoshy * Then we wait till all CPUs are done with this PMC. 2312145256Sjkoshy */ 2313145256Sjkoshy pm->pm_state = PMC_STATE_DELETED; 2314145256Sjkoshy 2315145256Sjkoshy 2316147191Sjkoshy /* Wait for the PMCs runcount to come to zero. */ 2317147191Sjkoshy pmc_wait_for_pmc_idle(pm); 2318145256Sjkoshy 2319145256Sjkoshy /* 2320145256Sjkoshy * At this point the PMC is off all CPUs and cannot be 2321145256Sjkoshy * freshly scheduled onto a CPU. It is now safe to 2322145256Sjkoshy * unlink all targets from this PMC. If a 2323145256Sjkoshy * process-record's refcount falls to zero, we remove 2324145256Sjkoshy * it from the hash table. The module-wide SX lock 2325145256Sjkoshy * protects us from races. 2326145256Sjkoshy */ 2327145256Sjkoshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 2328145256Sjkoshy pp = ptgt->pt_process; 2329145256Sjkoshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 2330145256Sjkoshy 2331145256Sjkoshy PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 2332145256Sjkoshy 2333145256Sjkoshy /* 2334145256Sjkoshy * If the target process record shows that no 2335145256Sjkoshy * PMCs are attached to it, reclaim its space. 2336145256Sjkoshy */ 2337145256Sjkoshy 2338145256Sjkoshy if (pp->pp_refcnt == 0) { 2339145256Sjkoshy pmc_remove_process_descriptor(pp); 2340184205Sdes free(pp, M_PMC); 2341145256Sjkoshy } 2342145256Sjkoshy } 2343145256Sjkoshy 2344145256Sjkoshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 2345145256Sjkoshy 2346145256Sjkoshy } 2347145256Sjkoshy 2348145256Sjkoshy /* 2349145256Sjkoshy * Release any MD resources 2350145256Sjkoshy */ 2351184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pm); 2352145256Sjkoshy 2353145256Sjkoshy /* 2354145256Sjkoshy * Update row disposition 2355145256Sjkoshy */ 2356145256Sjkoshy 2357145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 2358145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 2359145256Sjkoshy else 2360145256Sjkoshy PMC_UNMARK_ROW_THREAD(ri); 2361145256Sjkoshy 2362145256Sjkoshy /* unlink from the owner's list */ 2363147191Sjkoshy if (pm->pm_owner) { 2364147191Sjkoshy LIST_REMOVE(pm, pm_next); 2365147191Sjkoshy pm->pm_owner = NULL; 2366147191Sjkoshy } 2367145256Sjkoshy 2368145256Sjkoshy pmc_destroy_pmc_descriptor(pm); 2369145256Sjkoshy} 2370145256Sjkoshy 2371145256Sjkoshy/* 2372145256Sjkoshy * Register an owner and a pmc. 2373145256Sjkoshy */ 2374145256Sjkoshy 2375145256Sjkoshystatic int 2376145256Sjkoshypmc_register_owner(struct proc *p, struct pmc *pmc) 2377145256Sjkoshy{ 2378145256Sjkoshy struct pmc_owner *po; 2379145256Sjkoshy 2380145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2381145256Sjkoshy 2382145774Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2383147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 2384145256Sjkoshy return ENOMEM; 2385145256Sjkoshy 2386145256Sjkoshy KASSERT(pmc->pm_owner == NULL, 2387145256Sjkoshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 2388145256Sjkoshy pmc->pm_owner = po; 2389145256Sjkoshy 2390147191Sjkoshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 2391145256Sjkoshy 2392145256Sjkoshy PROC_LOCK(p); 2393145256Sjkoshy p->p_flag |= P_HWPMC; 2394145256Sjkoshy PROC_UNLOCK(p); 2395145256Sjkoshy 2396147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 2397147191Sjkoshy pmclog_process_pmcallocate(pmc); 2398145256Sjkoshy 2399147191Sjkoshy PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2400147191Sjkoshy po, pmc); 2401147191Sjkoshy 2402145256Sjkoshy return 0; 2403145256Sjkoshy} 2404145256Sjkoshy 2405145256Sjkoshy/* 2406145256Sjkoshy * Return the current row disposition: 2407145256Sjkoshy * == 0 => FREE 2408145256Sjkoshy * > 0 => PROCESS MODE 2409145256Sjkoshy * < 0 => SYSTEM MODE 2410145256Sjkoshy */ 2411145256Sjkoshy 2412145256Sjkoshyint 2413145256Sjkoshypmc_getrowdisp(int ri) 2414145256Sjkoshy{ 2415145256Sjkoshy return pmc_pmcdisp[ri]; 2416145256Sjkoshy} 2417145256Sjkoshy 2418145256Sjkoshy/* 2419145256Sjkoshy * Check if a PMC at row index 'ri' can be allocated to the current 2420145256Sjkoshy * process. 2421145256Sjkoshy * 2422145256Sjkoshy * Allocation can fail if: 2423145256Sjkoshy * - the current process is already being profiled by a PMC at index 'ri', 2424145256Sjkoshy * attached to it via OP_PMCATTACH. 2425145256Sjkoshy * - the current process has already allocated a PMC at index 'ri' 2426145256Sjkoshy * via OP_ALLOCATE. 2427145256Sjkoshy */ 2428145256Sjkoshy 2429145256Sjkoshystatic int 2430145774Sjkoshypmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2431145256Sjkoshy{ 2432145774Sjkoshy enum pmc_mode mode; 2433145774Sjkoshy struct pmc *pm; 2434145256Sjkoshy struct pmc_owner *po; 2435145256Sjkoshy struct pmc_process *pp; 2436145256Sjkoshy 2437145774Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2438145774Sjkoshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2439145256Sjkoshy 2440145774Sjkoshy /* 2441145774Sjkoshy * We shouldn't have already allocated a process-mode PMC at 2442145774Sjkoshy * row index 'ri'. 2443145774Sjkoshy * 2444145774Sjkoshy * We shouldn't have allocated a system-wide PMC on the same 2445145774Sjkoshy * CPU and same RI. 2446145774Sjkoshy */ 2447145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2448147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2449145774Sjkoshy if (PMC_TO_ROWINDEX(pm) == ri) { 2450145774Sjkoshy mode = PMC_TO_MODE(pm); 2451145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) 2452145774Sjkoshy return EEXIST; 2453145774Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && 2454145774Sjkoshy (int) PMC_TO_CPU(pm) == cpu) 2455145774Sjkoshy return EEXIST; 2456145774Sjkoshy } 2457145774Sjkoshy } 2458145256Sjkoshy 2459145774Sjkoshy /* 2460145774Sjkoshy * We also shouldn't be the target of any PMC at this index 2461145774Sjkoshy * since otherwise a PMC_ATTACH to ourselves will fail. 2462145774Sjkoshy */ 2463145256Sjkoshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2464145256Sjkoshy if (pp->pp_pmcs[ri].pp_pmc) 2465145256Sjkoshy return EEXIST; 2466145256Sjkoshy 2467145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2468145256Sjkoshy p, p->p_pid, p->p_comm, ri); 2469145256Sjkoshy 2470145256Sjkoshy return 0; 2471145256Sjkoshy} 2472145256Sjkoshy 2473145256Sjkoshy/* 2474145256Sjkoshy * Check if a given PMC at row index 'ri' can be currently used in 2475145256Sjkoshy * mode 'mode'. 2476145256Sjkoshy */ 2477145256Sjkoshy 2478145256Sjkoshystatic int 2479145256Sjkoshypmc_can_allocate_row(int ri, enum pmc_mode mode) 2480145256Sjkoshy{ 2481145256Sjkoshy enum pmc_disp disp; 2482145256Sjkoshy 2483145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2484145256Sjkoshy 2485145256Sjkoshy PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2486145256Sjkoshy 2487145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 2488145256Sjkoshy disp = PMC_DISP_STANDALONE; 2489145256Sjkoshy else 2490145256Sjkoshy disp = PMC_DISP_THREAD; 2491145256Sjkoshy 2492145256Sjkoshy /* 2493145256Sjkoshy * check disposition for PMC row 'ri': 2494145256Sjkoshy * 2495145256Sjkoshy * Expected disposition Row-disposition Result 2496145256Sjkoshy * 2497145256Sjkoshy * STANDALONE STANDALONE or FREE proceed 2498145256Sjkoshy * STANDALONE THREAD fail 2499145256Sjkoshy * THREAD THREAD or FREE proceed 2500145256Sjkoshy * THREAD STANDALONE fail 2501145256Sjkoshy */ 2502145256Sjkoshy 2503145256Sjkoshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2504145256Sjkoshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2505145256Sjkoshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2506145256Sjkoshy return EBUSY; 2507145256Sjkoshy 2508145256Sjkoshy /* 2509145256Sjkoshy * All OK 2510145256Sjkoshy */ 2511145256Sjkoshy 2512145256Sjkoshy PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2513145256Sjkoshy 2514145256Sjkoshy return 0; 2515145256Sjkoshy 2516145256Sjkoshy} 2517145256Sjkoshy 2518145256Sjkoshy/* 2519145774Sjkoshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2520145256Sjkoshy */ 2521145256Sjkoshy 2522145256Sjkoshystatic struct pmc * 2523145256Sjkoshypmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2524145256Sjkoshy{ 2525147191Sjkoshy struct pmc *pm; 2526145256Sjkoshy 2527145774Sjkoshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2528145774Sjkoshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2529145774Sjkoshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2530145256Sjkoshy 2531147191Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2532147191Sjkoshy if (pm->pm_id == pmcid) 2533147191Sjkoshy return pm; 2534145256Sjkoshy 2535145256Sjkoshy return NULL; 2536145256Sjkoshy} 2537145256Sjkoshy 2538145256Sjkoshystatic int 2539145256Sjkoshypmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2540145256Sjkoshy{ 2541145256Sjkoshy 2542145256Sjkoshy struct pmc *pm; 2543145256Sjkoshy struct pmc_owner *po; 2544145256Sjkoshy 2545145256Sjkoshy PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid); 2546145256Sjkoshy 2547145256Sjkoshy if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) 2548145256Sjkoshy return ESRCH; 2549145256Sjkoshy 2550145256Sjkoshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2551145256Sjkoshy return EINVAL; 2552145256Sjkoshy 2553145256Sjkoshy PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2554145256Sjkoshy 2555145256Sjkoshy *pmc = pm; 2556145256Sjkoshy return 0; 2557145256Sjkoshy} 2558145256Sjkoshy 2559145256Sjkoshy/* 2560145256Sjkoshy * Start a PMC. 2561145256Sjkoshy */ 2562145256Sjkoshy 2563145256Sjkoshystatic int 2564145256Sjkoshypmc_start(struct pmc *pm) 2565145256Sjkoshy{ 2566145774Sjkoshy enum pmc_mode mode; 2567147191Sjkoshy struct pmc_owner *po; 2568145256Sjkoshy struct pmc_binding pb; 2569184802Sjkoshy struct pmc_classdep *pcd; 2570184802Sjkoshy int adjri, error, cpu, ri; 2571145256Sjkoshy 2572145256Sjkoshy KASSERT(pm != NULL, 2573145256Sjkoshy ("[pmc,%d] null pm", __LINE__)); 2574145256Sjkoshy 2575145774Sjkoshy mode = PMC_TO_MODE(pm); 2576145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2577184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2578184802Sjkoshy 2579145774Sjkoshy error = 0; 2580145256Sjkoshy 2581145774Sjkoshy PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2582145774Sjkoshy 2583147191Sjkoshy po = pm->pm_owner; 2584145256Sjkoshy 2585174395Sjkoshy /* 2586174395Sjkoshy * Disallow PMCSTART if a logfile is required but has not been 2587174395Sjkoshy * configured yet. 2588174395Sjkoshy */ 2589174395Sjkoshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2590174395Sjkoshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2591184802Sjkoshy return (EDOOFUS); /* programming error */ 2592174395Sjkoshy 2593174395Sjkoshy /* 2594174395Sjkoshy * If this is a sampling mode PMC, log mapping information for 2595174395Sjkoshy * the kernel modules that are currently loaded. 2596174395Sjkoshy */ 2597174395Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2598174395Sjkoshy pmc_log_kernel_mappings(pm); 2599174395Sjkoshy 2600145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2601145256Sjkoshy 2602145256Sjkoshy /* 2603147191Sjkoshy * If a PMCATTACH has never been done on this PMC, 2604147191Sjkoshy * attach it to its owner process. 2605145256Sjkoshy */ 2606145256Sjkoshy 2607145256Sjkoshy if (LIST_EMPTY(&pm->pm_targets)) 2608147191Sjkoshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2609147191Sjkoshy pmc_attach_process(po->po_owner, pm); 2610145256Sjkoshy 2611145774Sjkoshy /* 2612147191Sjkoshy * If the PMC is attached to its owner, then force a context 2613147191Sjkoshy * switch to ensure that the MD state gets set correctly. 2614145256Sjkoshy */ 2615145256Sjkoshy 2616147191Sjkoshy if (error == 0) { 2617147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2618147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2619147191Sjkoshy pmc_force_context_switch(); 2620147191Sjkoshy } 2621147191Sjkoshy 2622184802Sjkoshy return (error); 2623147191Sjkoshy } 2624145256Sjkoshy 2625147191Sjkoshy 2626147191Sjkoshy /* 2627147191Sjkoshy * A system-wide PMC. 2628174395Sjkoshy * 2629147191Sjkoshy * Add the owner to the global list if this is a system-wide 2630147191Sjkoshy * sampling PMC. 2631147191Sjkoshy */ 2632147191Sjkoshy 2633147191Sjkoshy if (mode == PMC_MODE_SS) { 2634147191Sjkoshy if (po->po_sscount == 0) { 2635147191Sjkoshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2636147191Sjkoshy atomic_add_rel_int(&pmc_ss_count, 1); 2637147191Sjkoshy PMCDBG(PMC,OPS,1, "po=%p in global list", po); 2638147191Sjkoshy } 2639147191Sjkoshy po->po_sscount++; 2640145256Sjkoshy 2641207484Srstone /* 2642207484Srstone * Log mapping information for all existing processes in the 2643207484Srstone * system. Subsequent mappings are logged as they happen; 2644207484Srstone * see pmc_process_mmap(). 2645207484Srstone */ 2646207484Srstone if (po->po_logprocmaps == 0) { 2647207484Srstone pmc_log_all_process_mappings(po); 2648207484Srstone po->po_logprocmaps = 1; 2649207484Srstone } 2650201021Sjkoshy } 2651157144Sjkoshy 2652145256Sjkoshy /* 2653147191Sjkoshy * Move to the CPU associated with this 2654145256Sjkoshy * PMC, and start the hardware. 2655145256Sjkoshy */ 2656145256Sjkoshy 2657145256Sjkoshy pmc_save_cpu_binding(&pb); 2658145256Sjkoshy 2659145774Sjkoshy cpu = PMC_TO_CPU(pm); 2660145256Sjkoshy 2661183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2662184802Sjkoshy return (ENXIO); 2663145256Sjkoshy 2664145256Sjkoshy pmc_select_cpu(cpu); 2665145256Sjkoshy 2666145256Sjkoshy /* 2667145256Sjkoshy * global PMCs are configured at allocation time 2668145256Sjkoshy * so write out the initial value and start the PMC. 2669145256Sjkoshy */ 2670145256Sjkoshy 2671147191Sjkoshy pm->pm_state = PMC_STATE_RUNNING; 2672147191Sjkoshy 2673145774Sjkoshy critical_enter(); 2674184802Sjkoshy if ((error = pcd->pcd_write_pmc(cpu, adjri, 2675145774Sjkoshy PMC_IS_SAMPLING_MODE(mode) ? 2676145256Sjkoshy pm->pm_sc.pm_reloadcount : 2677145256Sjkoshy pm->pm_sc.pm_initial)) == 0) 2678184802Sjkoshy error = pcd->pcd_start_pmc(cpu, adjri); 2679145774Sjkoshy critical_exit(); 2680145256Sjkoshy 2681145256Sjkoshy pmc_restore_cpu_binding(&pb); 2682145256Sjkoshy 2683184802Sjkoshy return (error); 2684145256Sjkoshy} 2685145256Sjkoshy 2686145256Sjkoshy/* 2687145256Sjkoshy * Stop a PMC. 2688145256Sjkoshy */ 2689145256Sjkoshy 2690145256Sjkoshystatic int 2691145256Sjkoshypmc_stop(struct pmc *pm) 2692145256Sjkoshy{ 2693147191Sjkoshy struct pmc_owner *po; 2694145256Sjkoshy struct pmc_binding pb; 2695184802Sjkoshy struct pmc_classdep *pcd; 2696184802Sjkoshy int adjri, cpu, error, ri; 2697145256Sjkoshy 2698145256Sjkoshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2699145256Sjkoshy 2700145774Sjkoshy PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2701145774Sjkoshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2702145256Sjkoshy 2703145256Sjkoshy pm->pm_state = PMC_STATE_STOPPED; 2704145256Sjkoshy 2705145256Sjkoshy /* 2706145256Sjkoshy * If the PMC is a virtual mode one, changing the state to 2707145256Sjkoshy * non-RUNNING is enough to ensure that the PMC never gets 2708145256Sjkoshy * scheduled. 2709145256Sjkoshy * 2710145256Sjkoshy * If this PMC is current running on a CPU, then it will 2711145256Sjkoshy * handled correctly at the time its target process is context 2712145256Sjkoshy * switched out. 2713145256Sjkoshy */ 2714145256Sjkoshy 2715145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2716145256Sjkoshy return 0; 2717145256Sjkoshy 2718145256Sjkoshy /* 2719145256Sjkoshy * A system-mode PMC. Move to the CPU associated with 2720145256Sjkoshy * this PMC, and stop the hardware. We update the 2721145256Sjkoshy * 'initial count' so that a subsequent PMCSTART will 2722145256Sjkoshy * resume counting from the current hardware count. 2723145256Sjkoshy */ 2724145256Sjkoshy 2725145256Sjkoshy pmc_save_cpu_binding(&pb); 2726145256Sjkoshy 2727145774Sjkoshy cpu = PMC_TO_CPU(pm); 2728145256Sjkoshy 2729183266Sjkoshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 2730145774Sjkoshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2731145774Sjkoshy 2732183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 2733145256Sjkoshy return ENXIO; 2734145256Sjkoshy 2735145256Sjkoshy pmc_select_cpu(cpu); 2736145256Sjkoshy 2737145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 2738184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2739145256Sjkoshy 2740145774Sjkoshy critical_enter(); 2741184802Sjkoshy if ((error = pcd->pcd_stop_pmc(cpu, adjri)) == 0) 2742184802Sjkoshy error = pcd->pcd_read_pmc(cpu, adjri, &pm->pm_sc.pm_initial); 2743145774Sjkoshy critical_exit(); 2744145774Sjkoshy 2745145256Sjkoshy pmc_restore_cpu_binding(&pb); 2746145256Sjkoshy 2747147191Sjkoshy po = pm->pm_owner; 2748147191Sjkoshy 2749147191Sjkoshy /* remove this owner from the global list of SS PMC owners */ 2750147191Sjkoshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2751147191Sjkoshy po->po_sscount--; 2752147191Sjkoshy if (po->po_sscount == 0) { 2753147191Sjkoshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2754147191Sjkoshy LIST_REMOVE(po, po_ssnext); 2755147191Sjkoshy PMCDBG(PMC,OPS,2,"po=%p removed from global list", po); 2756147191Sjkoshy } 2757147191Sjkoshy } 2758147191Sjkoshy 2759184802Sjkoshy return (error); 2760145256Sjkoshy} 2761145256Sjkoshy 2762145256Sjkoshy 2763153110Sru#ifdef DEBUG 2764145256Sjkoshystatic const char *pmc_op_to_name[] = { 2765145256Sjkoshy#undef __PMC_OP 2766145256Sjkoshy#define __PMC_OP(N, D) #N , 2767145256Sjkoshy __PMC_OPS() 2768145256Sjkoshy NULL 2769145256Sjkoshy}; 2770145256Sjkoshy#endif 2771145256Sjkoshy 2772145256Sjkoshy/* 2773145256Sjkoshy * The syscall interface 2774145256Sjkoshy */ 2775145256Sjkoshy 2776145256Sjkoshy#define PMC_GET_SX_XLOCK(...) do { \ 2777145256Sjkoshy sx_xlock(&pmc_sx); \ 2778145256Sjkoshy if (pmc_hook == NULL) { \ 2779145256Sjkoshy sx_xunlock(&pmc_sx); \ 2780145256Sjkoshy return __VA_ARGS__; \ 2781145256Sjkoshy } \ 2782145256Sjkoshy} while (0) 2783145256Sjkoshy 2784145256Sjkoshy#define PMC_DOWNGRADE_SX() do { \ 2785145256Sjkoshy sx_downgrade(&pmc_sx); \ 2786145256Sjkoshy is_sx_downgraded = 1; \ 2787145256Sjkoshy} while (0) 2788145256Sjkoshy 2789145256Sjkoshystatic int 2790145256Sjkoshypmc_syscall_handler(struct thread *td, void *syscall_args) 2791145256Sjkoshy{ 2792195005Sattilio int error, is_sx_downgraded, is_sx_locked, op; 2793145256Sjkoshy struct pmc_syscall_args *c; 2794145256Sjkoshy void *arg; 2795145256Sjkoshy 2796145256Sjkoshy PMC_GET_SX_XLOCK(ENOSYS); 2797145256Sjkoshy 2798147191Sjkoshy DROP_GIANT(); 2799147191Sjkoshy 2800145256Sjkoshy is_sx_downgraded = 0; 2801195005Sattilio is_sx_locked = 1; 2802145256Sjkoshy 2803145256Sjkoshy c = (struct pmc_syscall_args *) syscall_args; 2804145256Sjkoshy 2805145256Sjkoshy op = c->pmop_code; 2806145256Sjkoshy arg = c->pmop_data; 2807145256Sjkoshy 2808145256Sjkoshy PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2809145256Sjkoshy pmc_op_to_name[op], arg); 2810145256Sjkoshy 2811145256Sjkoshy error = 0; 2812145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2813145256Sjkoshy 2814145256Sjkoshy switch(op) 2815145256Sjkoshy { 2816145256Sjkoshy 2817145256Sjkoshy 2818145256Sjkoshy /* 2819145256Sjkoshy * Configure a log file. 2820145256Sjkoshy * 2821145256Sjkoshy * XXX This OP will be reworked. 2822145256Sjkoshy */ 2823145256Sjkoshy 2824145256Sjkoshy case PMC_OP_CONFIGURELOG: 2825145256Sjkoshy { 2826157144Sjkoshy struct proc *p; 2827156466Sjkoshy struct pmc *pm; 2828145256Sjkoshy struct pmc_owner *po; 2829145256Sjkoshy struct pmc_op_configurelog cl; 2830145256Sjkoshy 2831145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2832145256Sjkoshy 2833145256Sjkoshy if ((error = copyin(arg, &cl, sizeof(cl))) != 0) 2834145256Sjkoshy break; 2835145256Sjkoshy 2836145256Sjkoshy /* mark this process as owning a log file */ 2837145256Sjkoshy p = td->td_proc; 2838145256Sjkoshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2839147191Sjkoshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2840147191Sjkoshy error = ENOMEM; 2841147191Sjkoshy break; 2842147191Sjkoshy } 2843145256Sjkoshy 2844147191Sjkoshy /* 2845147191Sjkoshy * If a valid fd was passed in, try to configure that, 2846147191Sjkoshy * otherwise if 'fd' was less than zero and there was 2847147191Sjkoshy * a log file configured, flush its buffers and 2848147191Sjkoshy * de-configure it. 2849147191Sjkoshy */ 2850195005Sattilio if (cl.pm_logfd >= 0) { 2851195005Sattilio sx_xunlock(&pmc_sx); 2852195005Sattilio is_sx_locked = 0; 2853185363Sjkoshy error = pmclog_configure_log(md, po, cl.pm_logfd); 2854195005Sattilio } else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2855147191Sjkoshy pmclog_process_closelog(po); 2856226514Sfabient error = pmclog_close(po); 2857156466Sjkoshy if (error == 0) { 2858156466Sjkoshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2859156834Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 2860156834Sjkoshy pm->pm_state == PMC_STATE_RUNNING) 2861156466Sjkoshy pmc_stop(pm); 2862147191Sjkoshy error = pmclog_deconfigure_log(po); 2863156466Sjkoshy } 2864147191Sjkoshy } else 2865147191Sjkoshy error = EINVAL; 2866157144Sjkoshy 2867157144Sjkoshy if (error) 2868157144Sjkoshy break; 2869147191Sjkoshy } 2870147191Sjkoshy break; 2871147191Sjkoshy 2872147191Sjkoshy /* 2873147191Sjkoshy * Flush a log file. 2874147191Sjkoshy */ 2875147191Sjkoshy 2876147191Sjkoshy case PMC_OP_FLUSHLOG: 2877147191Sjkoshy { 2878147191Sjkoshy struct pmc_owner *po; 2879147191Sjkoshy 2880147191Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 2881147191Sjkoshy 2882147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2883147191Sjkoshy error = EINVAL; 2884145256Sjkoshy break; 2885147191Sjkoshy } 2886145256Sjkoshy 2887147191Sjkoshy error = pmclog_flush(po); 2888145256Sjkoshy } 2889145256Sjkoshy break; 2890145256Sjkoshy 2891145256Sjkoshy /* 2892226514Sfabient * Close a log file. 2893226514Sfabient */ 2894226514Sfabient 2895226514Sfabient case PMC_OP_CLOSELOG: 2896226514Sfabient { 2897226514Sfabient struct pmc_owner *po; 2898226514Sfabient 2899226514Sfabient sx_assert(&pmc_sx, SX_XLOCKED); 2900226514Sfabient 2901226514Sfabient if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2902226514Sfabient error = EINVAL; 2903226514Sfabient break; 2904226514Sfabient } 2905226514Sfabient 2906226514Sfabient error = pmclog_close(po); 2907226514Sfabient } 2908226514Sfabient break; 2909226514Sfabient 2910226514Sfabient /* 2911145256Sjkoshy * Retrieve hardware configuration. 2912145256Sjkoshy */ 2913145256Sjkoshy 2914145256Sjkoshy case PMC_OP_GETCPUINFO: /* CPU information */ 2915145256Sjkoshy { 2916145256Sjkoshy struct pmc_op_getcpuinfo gci; 2917184802Sjkoshy struct pmc_classinfo *pci; 2918184802Sjkoshy struct pmc_classdep *pcd; 2919184802Sjkoshy int cl; 2920145256Sjkoshy 2921145256Sjkoshy gci.pm_cputype = md->pmd_cputype; 2922183266Sjkoshy gci.pm_ncpu = pmc_cpu_max(); 2923145256Sjkoshy gci.pm_npmc = md->pmd_npmc; 2924145256Sjkoshy gci.pm_nclass = md->pmd_nclass; 2925184802Sjkoshy pci = gci.pm_classes; 2926184802Sjkoshy pcd = md->pmd_classdep; 2927184802Sjkoshy for (cl = 0; cl < md->pmd_nclass; cl++, pci++, pcd++) { 2928184802Sjkoshy pci->pm_caps = pcd->pcd_caps; 2929184802Sjkoshy pci->pm_class = pcd->pcd_class; 2930184802Sjkoshy pci->pm_width = pcd->pcd_width; 2931184802Sjkoshy pci->pm_num = pcd->pcd_num; 2932184802Sjkoshy } 2933145256Sjkoshy error = copyout(&gci, arg, sizeof(gci)); 2934145256Sjkoshy } 2935145256Sjkoshy break; 2936145256Sjkoshy 2937233628Sfabient /* 2938233628Sfabient * Retrieve soft events list. 2939233628Sfabient */ 2940233628Sfabient case PMC_OP_GETDYNEVENTINFO: 2941233628Sfabient { 2942233628Sfabient enum pmc_class cl; 2943233628Sfabient enum pmc_event ev; 2944233628Sfabient struct pmc_op_getdyneventinfo *gei; 2945233628Sfabient struct pmc_dyn_event_descr dev; 2946233628Sfabient struct pmc_soft *ps; 2947233628Sfabient uint32_t nevent; 2948145256Sjkoshy 2949233628Sfabient sx_assert(&pmc_sx, SX_LOCKED); 2950233628Sfabient 2951233628Sfabient gei = (struct pmc_op_getdyneventinfo *) arg; 2952233628Sfabient 2953233628Sfabient if ((error = copyin(&gei->pm_class, &cl, sizeof(cl))) != 0) 2954233628Sfabient break; 2955233628Sfabient 2956233628Sfabient /* Only SOFT class is dynamic. */ 2957233628Sfabient if (cl != PMC_CLASS_SOFT) { 2958233628Sfabient error = EINVAL; 2959233628Sfabient break; 2960233628Sfabient } 2961233628Sfabient 2962233628Sfabient nevent = 0; 2963245339Ssbruno for (ev = PMC_EV_SOFT_FIRST; (int)ev <= PMC_EV_SOFT_LAST; ev++) { 2964233628Sfabient ps = pmc_soft_ev_acquire(ev); 2965233628Sfabient if (ps == NULL) 2966233628Sfabient continue; 2967233628Sfabient bcopy(&ps->ps_ev, &dev, sizeof(dev)); 2968233628Sfabient pmc_soft_ev_release(ps); 2969233628Sfabient 2970233628Sfabient error = copyout(&dev, 2971233628Sfabient &gei->pm_events[nevent], 2972233628Sfabient sizeof(struct pmc_dyn_event_descr)); 2973233628Sfabient if (error != 0) 2974233628Sfabient break; 2975233628Sfabient nevent++; 2976233628Sfabient } 2977233628Sfabient if (error != 0) 2978233628Sfabient break; 2979233628Sfabient 2980233628Sfabient error = copyout(&nevent, &gei->pm_nevent, 2981233628Sfabient sizeof(nevent)); 2982233628Sfabient } 2983233628Sfabient break; 2984233628Sfabient 2985145256Sjkoshy /* 2986145256Sjkoshy * Get module statistics 2987145256Sjkoshy */ 2988145256Sjkoshy 2989145256Sjkoshy case PMC_OP_GETDRIVERSTATS: 2990145256Sjkoshy { 2991145256Sjkoshy struct pmc_op_getdriverstats gms; 2992145256Sjkoshy 2993145256Sjkoshy bcopy(&pmc_stats, &gms, sizeof(gms)); 2994145256Sjkoshy error = copyout(&gms, arg, sizeof(gms)); 2995145256Sjkoshy } 2996145256Sjkoshy break; 2997145256Sjkoshy 2998145256Sjkoshy 2999145256Sjkoshy /* 3000145256Sjkoshy * Retrieve module version number 3001145256Sjkoshy */ 3002145256Sjkoshy 3003145256Sjkoshy case PMC_OP_GETMODULEVERSION: 3004145256Sjkoshy { 3005147191Sjkoshy uint32_t cv, modv; 3006147191Sjkoshy 3007147191Sjkoshy /* retrieve the client's idea of the ABI version */ 3008147191Sjkoshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 3009147191Sjkoshy break; 3010147191Sjkoshy /* don't service clients newer than our driver */ 3011147191Sjkoshy modv = PMC_VERSION; 3012147191Sjkoshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 3013147191Sjkoshy error = EPROGMISMATCH; 3014147191Sjkoshy break; 3015147191Sjkoshy } 3016147191Sjkoshy error = copyout(&modv, arg, sizeof(int)); 3017145256Sjkoshy } 3018145256Sjkoshy break; 3019145256Sjkoshy 3020145256Sjkoshy 3021145256Sjkoshy /* 3022145256Sjkoshy * Retrieve the state of all the PMCs on a given 3023145256Sjkoshy * CPU. 3024145256Sjkoshy */ 3025145256Sjkoshy 3026145256Sjkoshy case PMC_OP_GETPMCINFO: 3027145256Sjkoshy { 3028184802Sjkoshy int ari; 3029184802Sjkoshy struct pmc *pm; 3030184802Sjkoshy size_t pmcinfo_size; 3031145256Sjkoshy uint32_t cpu, n, npmc; 3032184802Sjkoshy struct pmc_owner *po; 3033184802Sjkoshy struct pmc_binding pb; 3034184802Sjkoshy struct pmc_classdep *pcd; 3035145256Sjkoshy struct pmc_info *p, *pmcinfo; 3036145256Sjkoshy struct pmc_op_getpmcinfo *gpi; 3037145256Sjkoshy 3038145256Sjkoshy PMC_DOWNGRADE_SX(); 3039145256Sjkoshy 3040145256Sjkoshy gpi = (struct pmc_op_getpmcinfo *) arg; 3041145256Sjkoshy 3042145256Sjkoshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 3043145256Sjkoshy break; 3044145256Sjkoshy 3045183266Sjkoshy if (cpu >= pmc_cpu_max()) { 3046145256Sjkoshy error = EINVAL; 3047145256Sjkoshy break; 3048145256Sjkoshy } 3049145256Sjkoshy 3050183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3051145256Sjkoshy error = ENXIO; 3052145256Sjkoshy break; 3053145256Sjkoshy } 3054145256Sjkoshy 3055145256Sjkoshy /* switch to CPU 'cpu' */ 3056145256Sjkoshy pmc_save_cpu_binding(&pb); 3057145256Sjkoshy pmc_select_cpu(cpu); 3058145256Sjkoshy 3059145256Sjkoshy npmc = md->pmd_npmc; 3060145256Sjkoshy 3061145256Sjkoshy pmcinfo_size = npmc * sizeof(struct pmc_info); 3062184214Sdes pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK); 3063145256Sjkoshy 3064145256Sjkoshy p = pmcinfo; 3065145256Sjkoshy 3066145256Sjkoshy for (n = 0; n < md->pmd_npmc; n++, p++) { 3067145256Sjkoshy 3068184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &ari); 3069184802Sjkoshy 3070184802Sjkoshy KASSERT(pcd != NULL, 3071184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 3072184802Sjkoshy 3073184802Sjkoshy if ((error = pcd->pcd_describe(cpu, ari, p, &pm)) != 0) 3074145256Sjkoshy break; 3075145256Sjkoshy 3076145256Sjkoshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 3077145256Sjkoshy p->pm_rowdisp = PMC_DISP_STANDALONE; 3078145256Sjkoshy else if (PMC_ROW_DISP_IS_THREAD(n)) 3079145256Sjkoshy p->pm_rowdisp = PMC_DISP_THREAD; 3080145256Sjkoshy else 3081145256Sjkoshy p->pm_rowdisp = PMC_DISP_FREE; 3082145256Sjkoshy 3083145256Sjkoshy p->pm_ownerpid = -1; 3084145256Sjkoshy 3085145256Sjkoshy if (pm == NULL) /* no PMC associated */ 3086145256Sjkoshy continue; 3087145256Sjkoshy 3088145256Sjkoshy po = pm->pm_owner; 3089145256Sjkoshy 3090145256Sjkoshy KASSERT(po->po_owner != NULL, 3091145256Sjkoshy ("[pmc,%d] pmc_owner had a null proc pointer", 3092145256Sjkoshy __LINE__)); 3093145256Sjkoshy 3094145256Sjkoshy p->pm_ownerpid = po->po_owner->p_pid; 3095145774Sjkoshy p->pm_mode = PMC_TO_MODE(pm); 3096145256Sjkoshy p->pm_event = pm->pm_event; 3097145256Sjkoshy p->pm_flags = pm->pm_flags; 3098145256Sjkoshy 3099145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3100145256Sjkoshy p->pm_reloadcount = 3101145256Sjkoshy pm->pm_sc.pm_reloadcount; 3102145256Sjkoshy } 3103145256Sjkoshy 3104145256Sjkoshy pmc_restore_cpu_binding(&pb); 3105145256Sjkoshy 3106145256Sjkoshy /* now copy out the PMC info collected */ 3107145256Sjkoshy if (error == 0) 3108145256Sjkoshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 3109145256Sjkoshy 3110184205Sdes free(pmcinfo, M_PMC); 3111145256Sjkoshy } 3112145256Sjkoshy break; 3113145256Sjkoshy 3114145256Sjkoshy 3115145256Sjkoshy /* 3116145256Sjkoshy * Set the administrative state of a PMC. I.e. whether 3117145256Sjkoshy * the PMC is to be used or not. 3118145256Sjkoshy */ 3119145256Sjkoshy 3120145256Sjkoshy case PMC_OP_PMCADMIN: 3121145256Sjkoshy { 3122145256Sjkoshy int cpu, ri; 3123145256Sjkoshy enum pmc_state request; 3124145256Sjkoshy struct pmc_cpu *pc; 3125145256Sjkoshy struct pmc_hw *phw; 3126145256Sjkoshy struct pmc_op_pmcadmin pma; 3127145256Sjkoshy struct pmc_binding pb; 3128145256Sjkoshy 3129145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3130145256Sjkoshy 3131145256Sjkoshy KASSERT(td == curthread, 3132145256Sjkoshy ("[pmc,%d] td != curthread", __LINE__)); 3133145256Sjkoshy 3134164033Srwatson error = priv_check(td, PRIV_PMC_MANAGE); 3135164033Srwatson if (error) 3136145256Sjkoshy break; 3137145256Sjkoshy 3138145256Sjkoshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 3139145256Sjkoshy break; 3140145256Sjkoshy 3141145256Sjkoshy cpu = pma.pm_cpu; 3142145256Sjkoshy 3143183266Sjkoshy if (cpu < 0 || cpu >= (int) pmc_cpu_max()) { 3144145256Sjkoshy error = EINVAL; 3145145256Sjkoshy break; 3146145256Sjkoshy } 3147145256Sjkoshy 3148183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3149145256Sjkoshy error = ENXIO; 3150145256Sjkoshy break; 3151145256Sjkoshy } 3152145256Sjkoshy 3153145256Sjkoshy request = pma.pm_state; 3154145256Sjkoshy 3155145256Sjkoshy if (request != PMC_STATE_DISABLED && 3156145256Sjkoshy request != PMC_STATE_FREE) { 3157145256Sjkoshy error = EINVAL; 3158145256Sjkoshy break; 3159145256Sjkoshy } 3160145256Sjkoshy 3161145256Sjkoshy ri = pma.pm_pmc; /* pmc id == row index */ 3162145256Sjkoshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 3163145256Sjkoshy error = EINVAL; 3164145256Sjkoshy break; 3165145256Sjkoshy } 3166145256Sjkoshy 3167145256Sjkoshy /* 3168145256Sjkoshy * We can't disable a PMC with a row-index allocated 3169145256Sjkoshy * for process virtual PMCs. 3170145256Sjkoshy */ 3171145256Sjkoshy 3172145256Sjkoshy if (PMC_ROW_DISP_IS_THREAD(ri) && 3173145256Sjkoshy request == PMC_STATE_DISABLED) { 3174145256Sjkoshy error = EBUSY; 3175145256Sjkoshy break; 3176145256Sjkoshy } 3177145256Sjkoshy 3178145256Sjkoshy /* 3179145256Sjkoshy * otherwise, this PMC on this CPU is either free or 3180145256Sjkoshy * in system-wide mode. 3181145256Sjkoshy */ 3182145256Sjkoshy 3183145256Sjkoshy pmc_save_cpu_binding(&pb); 3184145256Sjkoshy pmc_select_cpu(cpu); 3185145256Sjkoshy 3186145256Sjkoshy pc = pmc_pcpu[cpu]; 3187145256Sjkoshy phw = pc->pc_hwpmcs[ri]; 3188145256Sjkoshy 3189145256Sjkoshy /* 3190145256Sjkoshy * XXX do we need some kind of 'forced' disable? 3191145256Sjkoshy */ 3192145256Sjkoshy 3193145256Sjkoshy if (phw->phw_pmc == NULL) { 3194145256Sjkoshy if (request == PMC_STATE_DISABLED && 3195145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 3196145256Sjkoshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 3197145256Sjkoshy PMC_MARK_ROW_STANDALONE(ri); 3198145256Sjkoshy } else if (request == PMC_STATE_FREE && 3199145256Sjkoshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 3200145256Sjkoshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 3201145256Sjkoshy PMC_UNMARK_ROW_STANDALONE(ri); 3202145256Sjkoshy } 3203145256Sjkoshy /* other cases are a no-op */ 3204145256Sjkoshy } else 3205145256Sjkoshy error = EBUSY; 3206145256Sjkoshy 3207145256Sjkoshy pmc_restore_cpu_binding(&pb); 3208145256Sjkoshy } 3209145256Sjkoshy break; 3210145256Sjkoshy 3211145256Sjkoshy 3212145256Sjkoshy /* 3213145256Sjkoshy * Allocate a PMC. 3214145256Sjkoshy */ 3215145256Sjkoshy 3216145256Sjkoshy case PMC_OP_PMCALLOCATE: 3217145256Sjkoshy { 3218184802Sjkoshy int adjri, n; 3219184802Sjkoshy u_int cpu; 3220145256Sjkoshy uint32_t caps; 3221184802Sjkoshy struct pmc *pmc; 3222145256Sjkoshy enum pmc_mode mode; 3223145774Sjkoshy struct pmc_hw *phw; 3224184802Sjkoshy struct pmc_binding pb; 3225184802Sjkoshy struct pmc_classdep *pcd; 3226145256Sjkoshy struct pmc_op_pmcallocate pa; 3227145256Sjkoshy 3228145256Sjkoshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 3229145256Sjkoshy break; 3230145256Sjkoshy 3231145256Sjkoshy caps = pa.pm_caps; 3232145256Sjkoshy mode = pa.pm_mode; 3233145256Sjkoshy cpu = pa.pm_cpu; 3234145256Sjkoshy 3235145256Sjkoshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 3236145256Sjkoshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 3237183266Sjkoshy (cpu != (u_int) PMC_CPU_ANY && cpu >= pmc_cpu_max())) { 3238145256Sjkoshy error = EINVAL; 3239145256Sjkoshy break; 3240145256Sjkoshy } 3241145256Sjkoshy 3242145256Sjkoshy /* 3243145256Sjkoshy * Virtual PMCs should only ask for a default CPU. 3244145256Sjkoshy * System mode PMCs need to specify a non-default CPU. 3245145256Sjkoshy */ 3246145256Sjkoshy 3247145256Sjkoshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 3248145256Sjkoshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 3249145256Sjkoshy error = EINVAL; 3250145256Sjkoshy break; 3251145256Sjkoshy } 3252145256Sjkoshy 3253145256Sjkoshy /* 3254183266Sjkoshy * Check that an inactive CPU is not being asked for. 3255145256Sjkoshy */ 3256145256Sjkoshy 3257183266Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && !pmc_cpu_is_active(cpu)) { 3258145256Sjkoshy error = ENXIO; 3259145256Sjkoshy break; 3260145256Sjkoshy } 3261145256Sjkoshy 3262145256Sjkoshy /* 3263145256Sjkoshy * Refuse an allocation for a system-wide PMC if this 3264145256Sjkoshy * process has been jailed, or if this process lacks 3265145256Sjkoshy * super-user credentials and the sysctl tunable 3266145256Sjkoshy * 'security.bsd.unprivileged_syspmcs' is zero. 3267145256Sjkoshy */ 3268145256Sjkoshy 3269145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3270164033Srwatson if (jailed(curthread->td_ucred)) { 3271145256Sjkoshy error = EPERM; 3272164033Srwatson break; 3273164033Srwatson } 3274164033Srwatson if (!pmc_unprivileged_syspmcs) { 3275164033Srwatson error = priv_check(curthread, 3276164033Srwatson PRIV_PMC_SYSTEM); 3277164033Srwatson if (error) 3278164033Srwatson break; 3279164033Srwatson } 3280145256Sjkoshy } 3281145256Sjkoshy 3282145256Sjkoshy /* 3283145256Sjkoshy * Look for valid values for 'pm_flags' 3284145256Sjkoshy */ 3285145256Sjkoshy 3286147191Sjkoshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 3287174395Sjkoshy PMC_F_LOG_PROCEXIT | PMC_F_CALLCHAIN)) != 0) { 3288145256Sjkoshy error = EINVAL; 3289145256Sjkoshy break; 3290145256Sjkoshy } 3291145256Sjkoshy 3292147191Sjkoshy /* process logging options are not allowed for system PMCs */ 3293147191Sjkoshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 3294147191Sjkoshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 3295147191Sjkoshy error = EINVAL; 3296147191Sjkoshy break; 3297147191Sjkoshy } 3298147191Sjkoshy 3299145256Sjkoshy /* 3300145256Sjkoshy * All sampling mode PMCs need to be able to interrupt the 3301145256Sjkoshy * CPU. 3302145256Sjkoshy */ 3303147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode)) 3304145256Sjkoshy caps |= PMC_CAP_INTERRUPT; 3305145256Sjkoshy 3306149374Sjkoshy /* A valid class specifier should have been passed in. */ 3307149374Sjkoshy for (n = 0; n < md->pmd_nclass; n++) 3308184802Sjkoshy if (md->pmd_classdep[n].pcd_class == pa.pm_class) 3309149374Sjkoshy break; 3310149374Sjkoshy if (n == md->pmd_nclass) { 3311149374Sjkoshy error = EINVAL; 3312149374Sjkoshy break; 3313149374Sjkoshy } 3314149374Sjkoshy 3315149374Sjkoshy /* The requested PMC capabilities should be feasible. */ 3316184802Sjkoshy if ((md->pmd_classdep[n].pcd_caps & caps) != caps) { 3317149374Sjkoshy error = EOPNOTSUPP; 3318149374Sjkoshy break; 3319149374Sjkoshy } 3320149374Sjkoshy 3321145256Sjkoshy PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 3322145256Sjkoshy pa.pm_ev, caps, mode, cpu); 3323145256Sjkoshy 3324145256Sjkoshy pmc = pmc_allocate_pmc_descriptor(); 3325145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 3326145774Sjkoshy PMC_ID_INVALID); 3327145256Sjkoshy pmc->pm_event = pa.pm_ev; 3328145256Sjkoshy pmc->pm_state = PMC_STATE_FREE; 3329145256Sjkoshy pmc->pm_caps = caps; 3330145256Sjkoshy pmc->pm_flags = pa.pm_flags; 3331145256Sjkoshy 3332145256Sjkoshy /* switch thread to CPU 'cpu' */ 3333145256Sjkoshy pmc_save_cpu_binding(&pb); 3334145256Sjkoshy 3335145256Sjkoshy#define PMC_IS_SHAREABLE_PMC(cpu, n) \ 3336145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 3337145256Sjkoshy PMC_PHW_FLAG_IS_SHAREABLE) 3338145256Sjkoshy#define PMC_IS_UNALLOCATED(cpu, n) \ 3339145256Sjkoshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 3340145256Sjkoshy 3341145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) { 3342145256Sjkoshy pmc_select_cpu(cpu); 3343184802Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3344184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3345145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3346145256Sjkoshy pmc_can_allocate_rowindex( 3347145774Sjkoshy curthread->td_proc, n, cpu) == 0 && 3348145256Sjkoshy (PMC_IS_UNALLOCATED(cpu, n) || 3349145256Sjkoshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 3350184802Sjkoshy pcd->pcd_allocate_pmc(cpu, adjri, pmc, 3351145256Sjkoshy &pa) == 0) 3352145256Sjkoshy break; 3353184802Sjkoshy } 3354145256Sjkoshy } else { 3355145256Sjkoshy /* Process virtual mode */ 3356145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3357184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3358145256Sjkoshy if (pmc_can_allocate_row(n, mode) == 0 && 3359145256Sjkoshy pmc_can_allocate_rowindex( 3360145774Sjkoshy curthread->td_proc, n, 3361145774Sjkoshy PMC_CPU_ANY) == 0 && 3362184802Sjkoshy pcd->pcd_allocate_pmc(curthread->td_oncpu, 3363184802Sjkoshy adjri, pmc, &pa) == 0) 3364145256Sjkoshy break; 3365145256Sjkoshy } 3366145256Sjkoshy } 3367145256Sjkoshy 3368145256Sjkoshy#undef PMC_IS_UNALLOCATED 3369145256Sjkoshy#undef PMC_IS_SHAREABLE_PMC 3370145256Sjkoshy 3371145256Sjkoshy pmc_restore_cpu_binding(&pb); 3372145256Sjkoshy 3373145256Sjkoshy if (n == (int) md->pmd_npmc) { 3374145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3375184205Sdes free(pmc, M_PMC); 3376145256Sjkoshy pmc = NULL; 3377145256Sjkoshy error = EINVAL; 3378145256Sjkoshy break; 3379145256Sjkoshy } 3380145256Sjkoshy 3381145774Sjkoshy /* Fill in the correct value in the ID field */ 3382145774Sjkoshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 3383145256Sjkoshy 3384145774Sjkoshy PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 3385145774Sjkoshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 3386145774Sjkoshy 3387147191Sjkoshy /* Process mode PMCs with logging enabled need log files */ 3388147191Sjkoshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 3389147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3390147191Sjkoshy 3391147191Sjkoshy /* All system mode sampling PMCs require a log file */ 3392147191Sjkoshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 3393147191Sjkoshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3394147191Sjkoshy 3395145256Sjkoshy /* 3396145256Sjkoshy * Configure global pmc's immediately 3397145256Sjkoshy */ 3398145256Sjkoshy 3399145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 3400145774Sjkoshy 3401145774Sjkoshy pmc_save_cpu_binding(&pb); 3402145774Sjkoshy pmc_select_cpu(cpu); 3403145774Sjkoshy 3404145774Sjkoshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 3405184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3406145774Sjkoshy 3407145774Sjkoshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 3408184802Sjkoshy (error = pcd->pcd_config_pmc(cpu, adjri, pmc)) != 0) { 3409184802Sjkoshy (void) pcd->pcd_release_pmc(cpu, adjri, pmc); 3410145256Sjkoshy pmc_destroy_pmc_descriptor(pmc); 3411184205Sdes free(pmc, M_PMC); 3412145256Sjkoshy pmc = NULL; 3413145774Sjkoshy pmc_restore_cpu_binding(&pb); 3414145774Sjkoshy error = EPERM; 3415145256Sjkoshy break; 3416145256Sjkoshy } 3417145256Sjkoshy 3418145774Sjkoshy pmc_restore_cpu_binding(&pb); 3419145774Sjkoshy } 3420145256Sjkoshy 3421145256Sjkoshy pmc->pm_state = PMC_STATE_ALLOCATED; 3422145256Sjkoshy 3423145256Sjkoshy /* 3424145256Sjkoshy * mark row disposition 3425145256Sjkoshy */ 3426145256Sjkoshy 3427145256Sjkoshy if (PMC_IS_SYSTEM_MODE(mode)) 3428145256Sjkoshy PMC_MARK_ROW_STANDALONE(n); 3429145256Sjkoshy else 3430145256Sjkoshy PMC_MARK_ROW_THREAD(n); 3431145256Sjkoshy 3432145256Sjkoshy /* 3433145256Sjkoshy * Register this PMC with the current thread as its owner. 3434145256Sjkoshy */ 3435145256Sjkoshy 3436145256Sjkoshy if ((error = 3437145256Sjkoshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 3438145256Sjkoshy pmc_release_pmc_descriptor(pmc); 3439184205Sdes free(pmc, M_PMC); 3440145256Sjkoshy pmc = NULL; 3441145256Sjkoshy break; 3442145256Sjkoshy } 3443145256Sjkoshy 3444145256Sjkoshy /* 3445145256Sjkoshy * Return the allocated index. 3446145256Sjkoshy */ 3447145256Sjkoshy 3448145774Sjkoshy pa.pm_pmcid = pmc->pm_id; 3449145256Sjkoshy 3450145256Sjkoshy error = copyout(&pa, arg, sizeof(pa)); 3451145256Sjkoshy } 3452145256Sjkoshy break; 3453145256Sjkoshy 3454145256Sjkoshy 3455145256Sjkoshy /* 3456145256Sjkoshy * Attach a PMC to a process. 3457145256Sjkoshy */ 3458145256Sjkoshy 3459145256Sjkoshy case PMC_OP_PMCATTACH: 3460145256Sjkoshy { 3461145256Sjkoshy struct pmc *pm; 3462145256Sjkoshy struct proc *p; 3463145256Sjkoshy struct pmc_op_pmcattach a; 3464145256Sjkoshy 3465145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3466145256Sjkoshy 3467145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3468145256Sjkoshy break; 3469145256Sjkoshy 3470145256Sjkoshy if (a.pm_pid < 0) { 3471145256Sjkoshy error = EINVAL; 3472145256Sjkoshy break; 3473145256Sjkoshy } else if (a.pm_pid == 0) 3474145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3475145256Sjkoshy 3476145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3477145256Sjkoshy break; 3478145256Sjkoshy 3479145774Sjkoshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 3480145256Sjkoshy error = EINVAL; 3481145256Sjkoshy break; 3482145256Sjkoshy } 3483145256Sjkoshy 3484145256Sjkoshy /* PMCs may be (re)attached only when allocated or stopped */ 3485145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3486145256Sjkoshy error = EBUSY; 3487145256Sjkoshy break; 3488145256Sjkoshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 3489145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED) { 3490145256Sjkoshy error = EINVAL; 3491145256Sjkoshy break; 3492145256Sjkoshy } 3493145256Sjkoshy 3494145256Sjkoshy /* lookup pid */ 3495145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3496145256Sjkoshy error = ESRCH; 3497145256Sjkoshy break; 3498145256Sjkoshy } 3499145256Sjkoshy 3500145256Sjkoshy /* 3501145256Sjkoshy * Ignore processes that are working on exiting. 3502145256Sjkoshy */ 3503145256Sjkoshy if (p->p_flag & P_WEXIT) { 3504145256Sjkoshy error = ESRCH; 3505145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3506145256Sjkoshy break; 3507145256Sjkoshy } 3508145256Sjkoshy 3509145256Sjkoshy /* 3510145256Sjkoshy * we are allowed to attach a PMC to a process if 3511145256Sjkoshy * we can debug it. 3512145256Sjkoshy */ 3513145256Sjkoshy error = p_candebug(curthread, p); 3514145256Sjkoshy 3515145256Sjkoshy PROC_UNLOCK(p); 3516145256Sjkoshy 3517145256Sjkoshy if (error == 0) 3518145256Sjkoshy error = pmc_attach_process(p, pm); 3519145256Sjkoshy } 3520145256Sjkoshy break; 3521145256Sjkoshy 3522145256Sjkoshy 3523145256Sjkoshy /* 3524145256Sjkoshy * Detach an attached PMC from a process. 3525145256Sjkoshy */ 3526145256Sjkoshy 3527145256Sjkoshy case PMC_OP_PMCDETACH: 3528145256Sjkoshy { 3529145256Sjkoshy struct pmc *pm; 3530145256Sjkoshy struct proc *p; 3531145256Sjkoshy struct pmc_op_pmcattach a; 3532145256Sjkoshy 3533145256Sjkoshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3534145256Sjkoshy break; 3535145256Sjkoshy 3536145256Sjkoshy if (a.pm_pid < 0) { 3537145256Sjkoshy error = EINVAL; 3538145256Sjkoshy break; 3539145256Sjkoshy } else if (a.pm_pid == 0) 3540145256Sjkoshy a.pm_pid = td->td_proc->p_pid; 3541145256Sjkoshy 3542145256Sjkoshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3543145256Sjkoshy break; 3544145256Sjkoshy 3545145256Sjkoshy if ((p = pfind(a.pm_pid)) == NULL) { 3546145256Sjkoshy error = ESRCH; 3547145256Sjkoshy break; 3548145256Sjkoshy } 3549145256Sjkoshy 3550145256Sjkoshy /* 3551145256Sjkoshy * Treat processes that are in the process of exiting 3552145256Sjkoshy * as if they were not present. 3553145256Sjkoshy */ 3554145256Sjkoshy 3555145256Sjkoshy if (p->p_flag & P_WEXIT) 3556145256Sjkoshy error = ESRCH; 3557145256Sjkoshy 3558145256Sjkoshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3559145256Sjkoshy 3560145256Sjkoshy if (error == 0) 3561145256Sjkoshy error = pmc_detach_process(p, pm); 3562145256Sjkoshy } 3563145256Sjkoshy break; 3564145256Sjkoshy 3565145256Sjkoshy 3566145256Sjkoshy /* 3567147191Sjkoshy * Retrieve the MSR number associated with the counter 3568147191Sjkoshy * 'pmc_id'. This allows processes to directly use RDPMC 3569147191Sjkoshy * instructions to read their PMCs, without the overhead of a 3570147191Sjkoshy * system call. 3571147191Sjkoshy */ 3572147191Sjkoshy 3573147191Sjkoshy case PMC_OP_PMCGETMSR: 3574147191Sjkoshy { 3575184802Sjkoshy int adjri, ri; 3576184802Sjkoshy struct pmc *pm; 3577147191Sjkoshy struct pmc_target *pt; 3578147191Sjkoshy struct pmc_op_getmsr gm; 3579184802Sjkoshy struct pmc_classdep *pcd; 3580147191Sjkoshy 3581147191Sjkoshy PMC_DOWNGRADE_SX(); 3582147191Sjkoshy 3583147191Sjkoshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3584147191Sjkoshy break; 3585147191Sjkoshy 3586147191Sjkoshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3587147191Sjkoshy break; 3588147191Sjkoshy 3589147191Sjkoshy /* 3590147191Sjkoshy * The allocated PMC has to be a process virtual PMC, 3591147191Sjkoshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3592147191Sjkoshy * read using the PMCREAD operation since they may be 3593147191Sjkoshy * allocated on a different CPU than the one we could 3594147191Sjkoshy * be running on at the time of the RDPMC instruction. 3595147191Sjkoshy * 3596147191Sjkoshy * The GETMSR operation is not allowed for PMCs that 3597147191Sjkoshy * are inherited across processes. 3598147191Sjkoshy */ 3599147191Sjkoshy 3600147191Sjkoshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3601147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3602147191Sjkoshy error = EINVAL; 3603147191Sjkoshy break; 3604147191Sjkoshy } 3605147191Sjkoshy 3606147191Sjkoshy /* 3607147191Sjkoshy * It only makes sense to use a RDPMC (or its 3608147191Sjkoshy * equivalent instruction on non-x86 architectures) on 3609147191Sjkoshy * a process that has allocated and attached a PMC to 3610147191Sjkoshy * itself. Conversely the PMC is only allowed to have 3611147191Sjkoshy * one process attached to it -- its owner. 3612147191Sjkoshy */ 3613147191Sjkoshy 3614147191Sjkoshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3615147191Sjkoshy LIST_NEXT(pt, pt_next) != NULL || 3616147191Sjkoshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3617147191Sjkoshy error = EINVAL; 3618147191Sjkoshy break; 3619147191Sjkoshy } 3620147191Sjkoshy 3621147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3622184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3623147191Sjkoshy 3624184802Sjkoshy /* PMC class has no 'GETMSR' support */ 3625184802Sjkoshy if (pcd->pcd_get_msr == NULL) { 3626184802Sjkoshy error = ENOSYS; 3627147191Sjkoshy break; 3628184802Sjkoshy } 3629147191Sjkoshy 3630184802Sjkoshy if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) < 0) 3631184802Sjkoshy break; 3632184802Sjkoshy 3633147191Sjkoshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3634147191Sjkoshy break; 3635147191Sjkoshy 3636147191Sjkoshy /* 3637147191Sjkoshy * Mark our process as using MSRs. Update machine 3638147191Sjkoshy * state using a forced context switch. 3639147191Sjkoshy */ 3640147191Sjkoshy 3641147191Sjkoshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3642147191Sjkoshy pmc_force_context_switch(); 3643147191Sjkoshy 3644147191Sjkoshy } 3645147191Sjkoshy break; 3646147191Sjkoshy 3647147191Sjkoshy /* 3648145256Sjkoshy * Release an allocated PMC 3649145256Sjkoshy */ 3650145256Sjkoshy 3651145256Sjkoshy case PMC_OP_PMCRELEASE: 3652145256Sjkoshy { 3653145256Sjkoshy pmc_id_t pmcid; 3654145256Sjkoshy struct pmc *pm; 3655145256Sjkoshy struct pmc_owner *po; 3656145256Sjkoshy struct pmc_op_simple sp; 3657145256Sjkoshy 3658145256Sjkoshy /* 3659145256Sjkoshy * Find PMC pointer for the named PMC. 3660145256Sjkoshy * 3661145256Sjkoshy * Use pmc_release_pmc_descriptor() to switch off the 3662145256Sjkoshy * PMC, remove all its target threads, and remove the 3663145256Sjkoshy * PMC from its owner's list. 3664145256Sjkoshy * 3665145256Sjkoshy * Remove the owner record if this is the last PMC 3666145256Sjkoshy * owned. 3667145256Sjkoshy * 3668145256Sjkoshy * Free up space. 3669145256Sjkoshy */ 3670145256Sjkoshy 3671145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3672145256Sjkoshy break; 3673145256Sjkoshy 3674145256Sjkoshy pmcid = sp.pm_pmcid; 3675145256Sjkoshy 3676145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3677145256Sjkoshy break; 3678145256Sjkoshy 3679145256Sjkoshy po = pm->pm_owner; 3680145256Sjkoshy pmc_release_pmc_descriptor(pm); 3681145256Sjkoshy pmc_maybe_remove_owner(po); 3682145256Sjkoshy 3683184205Sdes free(pm, M_PMC); 3684145256Sjkoshy } 3685145256Sjkoshy break; 3686145256Sjkoshy 3687145256Sjkoshy 3688145256Sjkoshy /* 3689145256Sjkoshy * Read and/or write a PMC. 3690145256Sjkoshy */ 3691145256Sjkoshy 3692145256Sjkoshy case PMC_OP_PMCRW: 3693145256Sjkoshy { 3694184802Sjkoshy int adjri; 3695184802Sjkoshy struct pmc *pm; 3696145256Sjkoshy uint32_t cpu, ri; 3697184802Sjkoshy pmc_value_t oldvalue; 3698184802Sjkoshy struct pmc_binding pb; 3699184802Sjkoshy struct pmc_op_pmcrw prw; 3700184802Sjkoshy struct pmc_classdep *pcd; 3701145256Sjkoshy struct pmc_op_pmcrw *pprw; 3702145256Sjkoshy 3703145256Sjkoshy PMC_DOWNGRADE_SX(); 3704145256Sjkoshy 3705145256Sjkoshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3706145256Sjkoshy break; 3707145256Sjkoshy 3708145301Simp ri = 0; 3709145256Sjkoshy PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3710145256Sjkoshy prw.pm_flags); 3711145256Sjkoshy 3712145256Sjkoshy /* must have at least one flag set */ 3713145256Sjkoshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3714145256Sjkoshy error = EINVAL; 3715145256Sjkoshy break; 3716145256Sjkoshy } 3717145256Sjkoshy 3718145256Sjkoshy /* locate pmc descriptor */ 3719145256Sjkoshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3720145256Sjkoshy break; 3721145256Sjkoshy 3722145256Sjkoshy /* Can't read a PMC that hasn't been started. */ 3723145256Sjkoshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3724145256Sjkoshy pm->pm_state != PMC_STATE_STOPPED && 3725145256Sjkoshy pm->pm_state != PMC_STATE_RUNNING) { 3726145256Sjkoshy error = EINVAL; 3727145256Sjkoshy break; 3728145256Sjkoshy } 3729145256Sjkoshy 3730145256Sjkoshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3731145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 3732145256Sjkoshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3733145256Sjkoshy error = EBUSY; 3734145256Sjkoshy break; 3735145256Sjkoshy } 3736145256Sjkoshy 3737145774Sjkoshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3738145256Sjkoshy 3739145774Sjkoshy /* 3740145774Sjkoshy * If this PMC is attached to its owner (i.e., 3741145774Sjkoshy * the process requesting this operation) and 3742145774Sjkoshy * is running, then attempt to get an 3743145774Sjkoshy * upto-date reading from hardware for a READ. 3744145774Sjkoshy * Writes are only allowed when the PMC is 3745145774Sjkoshy * stopped, so only update the saved value 3746145774Sjkoshy * field. 3747145774Sjkoshy * 3748145774Sjkoshy * If the PMC is not running, or is not 3749145774Sjkoshy * attached to its owner, read/write to the 3750145774Sjkoshy * savedvalue field. 3751145774Sjkoshy */ 3752145774Sjkoshy 3753145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3754184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3755145774Sjkoshy 3756145256Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3757145774Sjkoshy cpu = curthread->td_oncpu; 3758145774Sjkoshy 3759145774Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3760145774Sjkoshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3761145774Sjkoshy (pm->pm_state == PMC_STATE_RUNNING)) 3762184802Sjkoshy error = (*pcd->pcd_read_pmc)(cpu, adjri, 3763145774Sjkoshy &oldvalue); 3764145774Sjkoshy else 3765145774Sjkoshy oldvalue = pm->pm_gv.pm_savedvalue; 3766145774Sjkoshy } 3767145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3768145256Sjkoshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3769145774Sjkoshy 3770145256Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3771145256Sjkoshy 3772145256Sjkoshy } else { /* System mode PMCs */ 3773145774Sjkoshy cpu = PMC_TO_CPU(pm); 3774145774Sjkoshy ri = PMC_TO_ROWINDEX(pm); 3775184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3776145256Sjkoshy 3777183266Sjkoshy if (!pmc_cpu_is_active(cpu)) { 3778145256Sjkoshy error = ENXIO; 3779145256Sjkoshy break; 3780145256Sjkoshy } 3781145256Sjkoshy 3782145256Sjkoshy /* move this thread to CPU 'cpu' */ 3783145256Sjkoshy pmc_save_cpu_binding(&pb); 3784145256Sjkoshy pmc_select_cpu(cpu); 3785145256Sjkoshy 3786145774Sjkoshy critical_enter(); 3787145256Sjkoshy /* save old value */ 3788145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3789184802Sjkoshy if ((error = (*pcd->pcd_read_pmc)(cpu, adjri, 3790145256Sjkoshy &oldvalue))) 3791145256Sjkoshy goto error; 3792145256Sjkoshy /* write out new value */ 3793145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3794184802Sjkoshy error = (*pcd->pcd_write_pmc)(cpu, adjri, 3795145256Sjkoshy prw.pm_value); 3796145256Sjkoshy error: 3797145774Sjkoshy critical_exit(); 3798145256Sjkoshy pmc_restore_cpu_binding(&pb); 3799145256Sjkoshy if (error) 3800145256Sjkoshy break; 3801145256Sjkoshy } 3802145256Sjkoshy 3803145256Sjkoshy pprw = (struct pmc_op_pmcrw *) arg; 3804145256Sjkoshy 3805153110Sru#ifdef DEBUG 3806145256Sjkoshy if (prw.pm_flags & PMC_F_NEWVALUE) 3807145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3808145256Sjkoshy ri, prw.pm_value, oldvalue); 3809156778Sjkoshy else if (prw.pm_flags & PMC_F_OLDVALUE) 3810145256Sjkoshy PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3811145256Sjkoshy#endif 3812145256Sjkoshy 3813145256Sjkoshy /* return old value if requested */ 3814145256Sjkoshy if (prw.pm_flags & PMC_F_OLDVALUE) 3815145256Sjkoshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3816145256Sjkoshy sizeof(prw.pm_value)))) 3817145256Sjkoshy break; 3818145256Sjkoshy 3819145256Sjkoshy } 3820145256Sjkoshy break; 3821145256Sjkoshy 3822145256Sjkoshy 3823145256Sjkoshy /* 3824145256Sjkoshy * Set the sampling rate for a sampling mode PMC and the 3825145256Sjkoshy * initial count for a counting mode PMC. 3826145256Sjkoshy */ 3827145256Sjkoshy 3828145256Sjkoshy case PMC_OP_PMCSETCOUNT: 3829145256Sjkoshy { 3830145256Sjkoshy struct pmc *pm; 3831145256Sjkoshy struct pmc_op_pmcsetcount sc; 3832145256Sjkoshy 3833145256Sjkoshy PMC_DOWNGRADE_SX(); 3834145256Sjkoshy 3835145256Sjkoshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3836145256Sjkoshy break; 3837145256Sjkoshy 3838145256Sjkoshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3839145256Sjkoshy break; 3840145256Sjkoshy 3841145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) { 3842145256Sjkoshy error = EBUSY; 3843145256Sjkoshy break; 3844145256Sjkoshy } 3845145256Sjkoshy 3846145774Sjkoshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3847145256Sjkoshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3848145256Sjkoshy else 3849145256Sjkoshy pm->pm_sc.pm_initial = sc.pm_count; 3850145256Sjkoshy } 3851145256Sjkoshy break; 3852145256Sjkoshy 3853145256Sjkoshy 3854145256Sjkoshy /* 3855145256Sjkoshy * Start a PMC. 3856145256Sjkoshy */ 3857145256Sjkoshy 3858145256Sjkoshy case PMC_OP_PMCSTART: 3859145256Sjkoshy { 3860145256Sjkoshy pmc_id_t pmcid; 3861145256Sjkoshy struct pmc *pm; 3862145256Sjkoshy struct pmc_op_simple sp; 3863145256Sjkoshy 3864145256Sjkoshy sx_assert(&pmc_sx, SX_XLOCKED); 3865145256Sjkoshy 3866145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3867145256Sjkoshy break; 3868145256Sjkoshy 3869145256Sjkoshy pmcid = sp.pm_pmcid; 3870145256Sjkoshy 3871145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3872145256Sjkoshy break; 3873145256Sjkoshy 3874145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3875145774Sjkoshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3876145774Sjkoshy pm->pm_id, pmcid)); 3877145256Sjkoshy 3878145256Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3879145256Sjkoshy break; 3880145256Sjkoshy else if (pm->pm_state != PMC_STATE_STOPPED && 3881145256Sjkoshy pm->pm_state != PMC_STATE_ALLOCATED) { 3882145256Sjkoshy error = EINVAL; 3883145256Sjkoshy break; 3884145256Sjkoshy } 3885145256Sjkoshy 3886145256Sjkoshy error = pmc_start(pm); 3887145256Sjkoshy } 3888145256Sjkoshy break; 3889145256Sjkoshy 3890145256Sjkoshy 3891145256Sjkoshy /* 3892145256Sjkoshy * Stop a PMC. 3893145256Sjkoshy */ 3894145256Sjkoshy 3895145256Sjkoshy case PMC_OP_PMCSTOP: 3896145256Sjkoshy { 3897145256Sjkoshy pmc_id_t pmcid; 3898145256Sjkoshy struct pmc *pm; 3899145256Sjkoshy struct pmc_op_simple sp; 3900145256Sjkoshy 3901145256Sjkoshy PMC_DOWNGRADE_SX(); 3902145256Sjkoshy 3903145256Sjkoshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3904145256Sjkoshy break; 3905145256Sjkoshy 3906145256Sjkoshy pmcid = sp.pm_pmcid; 3907145256Sjkoshy 3908145256Sjkoshy /* 3909145256Sjkoshy * Mark the PMC as inactive and invoke the MD stop 3910145256Sjkoshy * routines if needed. 3911145256Sjkoshy */ 3912145256Sjkoshy 3913145256Sjkoshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3914145256Sjkoshy break; 3915145256Sjkoshy 3916145774Sjkoshy KASSERT(pmcid == pm->pm_id, 3917145774Sjkoshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3918145774Sjkoshy pm->pm_id, pmcid)); 3919145256Sjkoshy 3920145256Sjkoshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3921145256Sjkoshy break; 3922145256Sjkoshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3923145256Sjkoshy error = EINVAL; 3924145256Sjkoshy break; 3925145256Sjkoshy } 3926145256Sjkoshy 3927145256Sjkoshy error = pmc_stop(pm); 3928145256Sjkoshy } 3929145256Sjkoshy break; 3930145256Sjkoshy 3931145256Sjkoshy 3932145256Sjkoshy /* 3933147867Sjkoshy * Write a user supplied value to the log file. 3934145256Sjkoshy */ 3935145256Sjkoshy 3936145256Sjkoshy case PMC_OP_WRITELOG: 3937145256Sjkoshy { 3938147191Sjkoshy struct pmc_op_writelog wl; 3939147191Sjkoshy struct pmc_owner *po; 3940145256Sjkoshy 3941145256Sjkoshy PMC_DOWNGRADE_SX(); 3942145256Sjkoshy 3943147191Sjkoshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 3944145256Sjkoshy break; 3945145256Sjkoshy 3946147191Sjkoshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3947145256Sjkoshy error = EINVAL; 3948145256Sjkoshy break; 3949145256Sjkoshy } 3950145256Sjkoshy 3951147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 3952145774Sjkoshy error = EINVAL; 3953145774Sjkoshy break; 3954145774Sjkoshy } 3955145774Sjkoshy 3956147191Sjkoshy error = pmclog_process_userlog(po, &wl); 3957145256Sjkoshy } 3958145256Sjkoshy break; 3959145256Sjkoshy 3960147191Sjkoshy 3961145256Sjkoshy default: 3962145256Sjkoshy error = EINVAL; 3963145256Sjkoshy break; 3964145256Sjkoshy } 3965145256Sjkoshy 3966195005Sattilio if (is_sx_locked != 0) { 3967195005Sattilio if (is_sx_downgraded) 3968195005Sattilio sx_sunlock(&pmc_sx); 3969195005Sattilio else 3970195005Sattilio sx_xunlock(&pmc_sx); 3971195005Sattilio } 3972145256Sjkoshy 3973145256Sjkoshy if (error) 3974145256Sjkoshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 3975145256Sjkoshy 3976147191Sjkoshy PICKUP_GIANT(); 3977147191Sjkoshy 3978145256Sjkoshy return error; 3979145256Sjkoshy} 3980145256Sjkoshy 3981145256Sjkoshy/* 3982145256Sjkoshy * Helper functions 3983145256Sjkoshy */ 3984145256Sjkoshy 3985147191Sjkoshy 3986145256Sjkoshy/* 3987174395Sjkoshy * Mark the thread as needing callchain capture and post an AST. The 3988174395Sjkoshy * actual callchain capture will be done in a context where it is safe 3989174395Sjkoshy * to take page faults. 3990174395Sjkoshy */ 3991174395Sjkoshy 3992174395Sjkoshystatic void 3993186037Sjkoshypmc_post_callchain_callback(void) 3994174395Sjkoshy{ 3995174395Sjkoshy struct thread *td; 3996174395Sjkoshy 3997174395Sjkoshy td = curthread; 3998174395Sjkoshy 3999205998Sfabient /* 4000205998Sfabient * If there is multiple PMCs for the same interrupt ignore new post 4001205998Sfabient */ 4002205998Sfabient if (td->td_pflags & TDP_CALLCHAIN) 4003205998Sfabient return; 4004186037Sjkoshy 4005174395Sjkoshy /* 4006186037Sjkoshy * Mark this thread as needing callchain capture. 4007186037Sjkoshy * `td->td_pflags' will be safe to touch because this thread 4008186037Sjkoshy * was in user space when it was interrupted. 4009174395Sjkoshy */ 4010174395Sjkoshy td->td_pflags |= TDP_CALLCHAIN; 4011174395Sjkoshy 4012174395Sjkoshy /* 4013186037Sjkoshy * Don't let this thread migrate between CPUs until callchain 4014186037Sjkoshy * capture completes. 4015174395Sjkoshy */ 4016186037Sjkoshy sched_pin(); 4017174395Sjkoshy 4018174395Sjkoshy return; 4019174395Sjkoshy} 4020174395Sjkoshy 4021174395Sjkoshy/* 4022147191Sjkoshy * Interrupt processing. 4023147191Sjkoshy * 4024174395Sjkoshy * Find a free slot in the per-cpu array of samples and capture the 4025174395Sjkoshy * current callchain there. If a sample was successfully added, a bit 4026174395Sjkoshy * is set in mask 'pmc_cpumask' denoting that the DO_SAMPLES hook 4027174395Sjkoshy * needs to be invoked from the clock handler. 4028147191Sjkoshy * 4029147191Sjkoshy * This function is meant to be called from an NMI handler. It cannot 4030147191Sjkoshy * use any of the locking primitives supplied by the OS. 4031145256Sjkoshy */ 4032145256Sjkoshy 4033147191Sjkoshyint 4034233628Sfabientpmc_process_interrupt(int cpu, int ring, struct pmc *pm, struct trapframe *tf, 4035174395Sjkoshy int inuserspace) 4036145256Sjkoshy{ 4037174395Sjkoshy int error, callchaindepth; 4038147191Sjkoshy struct thread *td; 4039147191Sjkoshy struct pmc_sample *ps; 4040147191Sjkoshy struct pmc_samplebuffer *psb; 4041145256Sjkoshy 4042147191Sjkoshy error = 0; 4043145256Sjkoshy 4044174395Sjkoshy /* 4045174395Sjkoshy * Allocate space for a sample buffer. 4046174395Sjkoshy */ 4047233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4048145256Sjkoshy 4049147191Sjkoshy ps = psb->ps_write; 4050174395Sjkoshy if (ps->ps_nsamples) { /* in use, reader hasn't caught up */ 4051147867Sjkoshy pm->pm_stalled = 1; 4052147191Sjkoshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 4053174395Sjkoshy PMCDBG(SAM,INT,1,"(spc) cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", 4054174395Sjkoshy cpu, pm, (void *) tf, inuserspace, 4055147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4056147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4057147191Sjkoshy error = ENOMEM; 4058147191Sjkoshy goto done; 4059147191Sjkoshy } 4060145256Sjkoshy 4061174395Sjkoshy 4062174395Sjkoshy /* Fill in entry. */ 4063174395Sjkoshy PMCDBG(SAM,INT,1,"cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", cpu, pm, 4064174395Sjkoshy (void *) tf, inuserspace, 4065147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4066147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4067145256Sjkoshy 4068186037Sjkoshy KASSERT(pm->pm_runcount >= 0, 4069186037Sjkoshy ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm, 4070186037Sjkoshy pm->pm_runcount)); 4071186037Sjkoshy 4072208861Sfabient atomic_add_rel_int(&pm->pm_runcount, 1); /* hold onto PMC */ 4073233628Sfabient 4074147191Sjkoshy ps->ps_pmc = pm; 4075147191Sjkoshy if ((td = curthread) && td->td_proc) 4076147191Sjkoshy ps->ps_pid = td->td_proc->p_pid; 4077147191Sjkoshy else 4078147191Sjkoshy ps->ps_pid = -1; 4079174395Sjkoshy ps->ps_cpu = cpu; 4080186037Sjkoshy ps->ps_td = td; 4081174395Sjkoshy ps->ps_flags = inuserspace ? PMC_CC_F_USERSPACE : 0; 4082145256Sjkoshy 4083174395Sjkoshy callchaindepth = (pm->pm_flags & PMC_F_CALLCHAIN) ? 4084174395Sjkoshy pmc_callchaindepth : 1; 4085174395Sjkoshy 4086174395Sjkoshy if (callchaindepth == 1) 4087174395Sjkoshy ps->ps_pc[0] = PMC_TRAPFRAME_TO_PC(tf); 4088174395Sjkoshy else { 4089174395Sjkoshy /* 4090174395Sjkoshy * Kernel stack traversals can be done immediately, 4091174395Sjkoshy * while we defer to an AST for user space traversals. 4092174395Sjkoshy */ 4093233628Sfabient if (!inuserspace) { 4094174395Sjkoshy callchaindepth = 4095174395Sjkoshy pmc_save_kernel_callchain(ps->ps_pc, 4096174395Sjkoshy callchaindepth, tf); 4097233628Sfabient } else { 4098186037Sjkoshy pmc_post_callchain_callback(); 4099174395Sjkoshy callchaindepth = PMC_SAMPLE_INUSE; 4100174395Sjkoshy } 4101174395Sjkoshy } 4102174395Sjkoshy 4103174395Sjkoshy ps->ps_nsamples = callchaindepth; /* mark entry as in use */ 4104174395Sjkoshy 4105147191Sjkoshy /* increment write pointer, modulo ring buffer size */ 4106147191Sjkoshy ps++; 4107147191Sjkoshy if (ps == psb->ps_fence) 4108147191Sjkoshy psb->ps_write = psb->ps_samples; 4109147191Sjkoshy else 4110147191Sjkoshy psb->ps_write = ps; 4111145256Sjkoshy 4112147191Sjkoshy done: 4113147191Sjkoshy /* mark CPU as needing processing */ 4114222813Sattilio CPU_SET_ATOMIC(cpu, &pmc_cpumask); 4115147191Sjkoshy 4116174395Sjkoshy return (error); 4117145256Sjkoshy} 4118145256Sjkoshy 4119174395Sjkoshy/* 4120174395Sjkoshy * Capture a user call chain. This function will be called from ast() 4121174395Sjkoshy * before control returns to userland and before the process gets 4122174395Sjkoshy * rescheduled. 4123174395Sjkoshy */ 4124147191Sjkoshy 4125174395Sjkoshystatic void 4126233628Sfabientpmc_capture_user_callchain(int cpu, int ring, struct trapframe *tf) 4127174395Sjkoshy{ 4128174395Sjkoshy int i; 4129174395Sjkoshy struct pmc *pm; 4130186037Sjkoshy struct thread *td; 4131174395Sjkoshy struct pmc_sample *ps; 4132174395Sjkoshy struct pmc_samplebuffer *psb; 4133186037Sjkoshy#ifdef INVARIANTS 4134186037Sjkoshy int ncallchains; 4135186037Sjkoshy#endif 4136174395Sjkoshy 4137233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4138186037Sjkoshy td = curthread; 4139174395Sjkoshy 4140186037Sjkoshy KASSERT(td->td_pflags & TDP_CALLCHAIN, 4141186037Sjkoshy ("[pmc,%d] Retrieving callchain for thread that doesn't want it", 4142186037Sjkoshy __LINE__)); 4143186037Sjkoshy 4144186037Sjkoshy#ifdef INVARIANTS 4145186037Sjkoshy ncallchains = 0; 4146186037Sjkoshy#endif 4147186037Sjkoshy 4148174395Sjkoshy /* 4149174395Sjkoshy * Iterate through all deferred callchain requests. 4150174395Sjkoshy */ 4151174395Sjkoshy 4152186037Sjkoshy ps = psb->ps_samples; 4153186037Sjkoshy for (i = 0; i < pmc_nsamples; i++, ps++) { 4154174395Sjkoshy 4155174395Sjkoshy if (ps->ps_nsamples != PMC_SAMPLE_INUSE) 4156174395Sjkoshy continue; 4157186037Sjkoshy if (ps->ps_td != td) 4158186037Sjkoshy continue; 4159174395Sjkoshy 4160186037Sjkoshy KASSERT(ps->ps_cpu == cpu, 4161186037Sjkoshy ("[pmc,%d] cpu mismatch ps_cpu=%d pcpu=%d", __LINE__, 4162186037Sjkoshy ps->ps_cpu, PCPU_GET(cpuid))); 4163186037Sjkoshy 4164174395Sjkoshy pm = ps->ps_pmc; 4165174395Sjkoshy 4166174395Sjkoshy KASSERT(pm->pm_flags & PMC_F_CALLCHAIN, 4167174395Sjkoshy ("[pmc,%d] Retrieving callchain for PMC that doesn't " 4168174395Sjkoshy "want it", __LINE__)); 4169174395Sjkoshy 4170186037Sjkoshy KASSERT(pm->pm_runcount > 0, 4171186037Sjkoshy ("[pmc,%d] runcount %d", __LINE__, pm->pm_runcount)); 4172186037Sjkoshy 4173174395Sjkoshy /* 4174174395Sjkoshy * Retrieve the callchain and mark the sample buffer 4175174395Sjkoshy * as 'processable' by the timer tick sweep code. 4176174395Sjkoshy */ 4177174395Sjkoshy ps->ps_nsamples = pmc_save_user_callchain(ps->ps_pc, 4178174395Sjkoshy pmc_callchaindepth, tf); 4179186037Sjkoshy 4180186037Sjkoshy#ifdef INVARIANTS 4181186037Sjkoshy ncallchains++; 4182186037Sjkoshy#endif 4183174395Sjkoshy } 4184174395Sjkoshy 4185186037Sjkoshy KASSERT(ncallchains > 0, 4186186037Sjkoshy ("[pmc,%d] cpu %d didn't find a sample to collect", __LINE__, 4187186037Sjkoshy cpu)); 4188186037Sjkoshy 4189242361Sattilio KASSERT(td->td_pinned == 1, 4190233628Sfabient ("[pmc,%d] invalid td_pinned value", __LINE__)); 4191233628Sfabient sched_unpin(); /* Can migrate safely now. */ 4192233628Sfabient 4193174395Sjkoshy return; 4194174395Sjkoshy} 4195174395Sjkoshy 4196145256Sjkoshy/* 4197147191Sjkoshy * Process saved PC samples. 4198145256Sjkoshy */ 4199145256Sjkoshy 4200145256Sjkoshystatic void 4201233628Sfabientpmc_process_samples(int cpu, int ring) 4202145256Sjkoshy{ 4203147191Sjkoshy struct pmc *pm; 4204185363Sjkoshy int adjri, n; 4205147191Sjkoshy struct thread *td; 4206147191Sjkoshy struct pmc_owner *po; 4207147191Sjkoshy struct pmc_sample *ps; 4208184802Sjkoshy struct pmc_classdep *pcd; 4209147191Sjkoshy struct pmc_samplebuffer *psb; 4210145256Sjkoshy 4211147191Sjkoshy KASSERT(PCPU_GET(cpuid) == cpu, 4212147191Sjkoshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 4213147191Sjkoshy PCPU_GET(cpuid), cpu)); 4214145256Sjkoshy 4215233628Sfabient psb = pmc_pcpu[cpu]->pc_sb[ring]; 4216147191Sjkoshy 4217147191Sjkoshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 4218147191Sjkoshy 4219147191Sjkoshy ps = psb->ps_read; 4220174395Sjkoshy if (ps->ps_nsamples == PMC_SAMPLE_FREE) 4221147191Sjkoshy break; 4222147191Sjkoshy 4223147191Sjkoshy pm = ps->ps_pmc; 4224186037Sjkoshy 4225186037Sjkoshy KASSERT(pm->pm_runcount > 0, 4226186037Sjkoshy ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm, 4227186037Sjkoshy pm->pm_runcount)); 4228186037Sjkoshy 4229147191Sjkoshy po = pm->pm_owner; 4230147191Sjkoshy 4231147191Sjkoshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 4232147191Sjkoshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 4233147191Sjkoshy pm, PMC_TO_MODE(pm))); 4234147191Sjkoshy 4235147191Sjkoshy /* Ignore PMCs that have been switched off */ 4236147191Sjkoshy if (pm->pm_state != PMC_STATE_RUNNING) 4237147191Sjkoshy goto entrydone; 4238147191Sjkoshy 4239233628Sfabient /* If there is a pending AST wait for completion */ 4240233628Sfabient if (ps->ps_nsamples == PMC_SAMPLE_INUSE) { 4241233628Sfabient /* Need a rescan at a later time. */ 4242233628Sfabient CPU_SET_ATOMIC(cpu, &pmc_cpumask); 4243233628Sfabient break; 4244233628Sfabient } 4245233628Sfabient 4246174395Sjkoshy PMCDBG(SAM,OPS,1,"cpu=%d pm=%p n=%d fl=%x wr=%d rd=%d", cpu, 4247174395Sjkoshy pm, ps->ps_nsamples, ps->ps_flags, 4248147191Sjkoshy (int) (psb->ps_write - psb->ps_samples), 4249147191Sjkoshy (int) (psb->ps_read - psb->ps_samples)); 4250147191Sjkoshy 4251147191Sjkoshy /* 4252147191Sjkoshy * If this is a process-mode PMC that is attached to 4253147191Sjkoshy * its owner, and if the PC is in user mode, update 4254147191Sjkoshy * profiling statistics like timer-based profiling 4255147191Sjkoshy * would have done. 4256147191Sjkoshy */ 4257147191Sjkoshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 4258174395Sjkoshy if (ps->ps_flags & PMC_CC_F_USERSPACE) { 4259147191Sjkoshy td = FIRST_THREAD_IN_PROC(po->po_owner); 4260174395Sjkoshy addupc_intr(td, ps->ps_pc[0], 1); 4261147191Sjkoshy } 4262147191Sjkoshy goto entrydone; 4263147191Sjkoshy } 4264147191Sjkoshy 4265147191Sjkoshy /* 4266147191Sjkoshy * Otherwise, this is either a sampling mode PMC that 4267147191Sjkoshy * is attached to a different process than its owner, 4268147191Sjkoshy * or a system-wide sampling PMC. Dispatch a log 4269147191Sjkoshy * entry to the PMC's owner process. 4270147191Sjkoshy */ 4271174395Sjkoshy pmclog_process_callchain(pm, ps); 4272147191Sjkoshy 4273147191Sjkoshy entrydone: 4274233628Sfabient ps->ps_nsamples = 0; /* mark entry as free */ 4275208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount, 1); 4276147191Sjkoshy 4277147191Sjkoshy /* increment read pointer, modulo sample size */ 4278147191Sjkoshy if (++ps == psb->ps_fence) 4279147191Sjkoshy psb->ps_read = psb->ps_samples; 4280147191Sjkoshy else 4281147191Sjkoshy psb->ps_read = ps; 4282147191Sjkoshy } 4283147191Sjkoshy 4284147191Sjkoshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 4285147191Sjkoshy 4286147191Sjkoshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 4287147191Sjkoshy if (n == 0) 4288147191Sjkoshy return; 4289147191Sjkoshy 4290147191Sjkoshy /* 4291147191Sjkoshy * Restart any stalled sampling PMCs on this CPU. 4292147191Sjkoshy * 4293147867Sjkoshy * If the NMI handler sets the pm_stalled field of a PMC after 4294147867Sjkoshy * the check below, we'll end up processing the stalled PMC at 4295147867Sjkoshy * the next hardclock tick. 4296147191Sjkoshy */ 4297147191Sjkoshy for (n = 0; n < md->pmd_npmc; n++) { 4298184802Sjkoshy pcd = pmc_ri_to_classdep(md, n, &adjri); 4299184802Sjkoshy KASSERT(pcd != NULL, 4300184802Sjkoshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 4301184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu,adjri,&pm); 4302184802Sjkoshy 4303147191Sjkoshy if (pm == NULL || /* !cfg'ed */ 4304147191Sjkoshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 4305147191Sjkoshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 4306147867Sjkoshy pm->pm_stalled == 0) /* !stalled */ 4307147191Sjkoshy continue; 4308147191Sjkoshy 4309147867Sjkoshy pm->pm_stalled = 0; 4310184802Sjkoshy (*pcd->pcd_start_pmc)(cpu, adjri); 4311147191Sjkoshy } 4312145256Sjkoshy} 4313145256Sjkoshy 4314145256Sjkoshy/* 4315145256Sjkoshy * Event handlers. 4316145256Sjkoshy */ 4317145256Sjkoshy 4318145256Sjkoshy/* 4319145256Sjkoshy * Handle a process exit. 4320145256Sjkoshy * 4321147191Sjkoshy * Remove this process from all hash tables. If this process 4322147191Sjkoshy * owned any PMCs, turn off those PMCs and deallocate them, 4323147191Sjkoshy * removing any associations with target processes. 4324147191Sjkoshy * 4325147191Sjkoshy * This function will be called by the last 'thread' of a 4326147191Sjkoshy * process. 4327147191Sjkoshy * 4328145256Sjkoshy * XXX This eventhandler gets called early in the exit process. 4329145256Sjkoshy * Consider using a 'hook' invocation from thread_exit() or equivalent 4330145256Sjkoshy * spot. Another negative is that kse_exit doesn't seem to call 4331145256Sjkoshy * exit1() [??]. 4332147191Sjkoshy * 4333145256Sjkoshy */ 4334145256Sjkoshy 4335145256Sjkoshystatic void 4336145256Sjkoshypmc_process_exit(void *arg __unused, struct proc *p) 4337145256Sjkoshy{ 4338184802Sjkoshy struct pmc *pm; 4339184802Sjkoshy int adjri, cpu; 4340184802Sjkoshy unsigned int ri; 4341145256Sjkoshy int is_using_hwpmcs; 4342184802Sjkoshy struct pmc_owner *po; 4343147191Sjkoshy struct pmc_process *pp; 4344184802Sjkoshy struct pmc_classdep *pcd; 4345147191Sjkoshy pmc_value_t newvalue, tmp; 4346145256Sjkoshy 4347145256Sjkoshy PROC_LOCK(p); 4348145256Sjkoshy is_using_hwpmcs = p->p_flag & P_HWPMC; 4349145256Sjkoshy PROC_UNLOCK(p); 4350145256Sjkoshy 4351147191Sjkoshy /* 4352147191Sjkoshy * Log a sysexit event to all SS PMC owners. 4353147191Sjkoshy */ 4354147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4355147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4356147191Sjkoshy pmclog_process_sysexit(po, p->p_pid); 4357145256Sjkoshy 4358147191Sjkoshy if (!is_using_hwpmcs) 4359147191Sjkoshy return; 4360147191Sjkoshy 4361147191Sjkoshy PMC_GET_SX_XLOCK(); 4362147191Sjkoshy PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 4363147191Sjkoshy p->p_comm); 4364147191Sjkoshy 4365147191Sjkoshy /* 4366147191Sjkoshy * Since this code is invoked by the last thread in an exiting 4367147191Sjkoshy * process, we would have context switched IN at some prior 4368147191Sjkoshy * point. However, with PREEMPTION, kernel mode context 4369147191Sjkoshy * switches may happen any time, so we want to disable a 4370147191Sjkoshy * context switch OUT till we get any PMCs targetting this 4371147191Sjkoshy * process off the hardware. 4372147191Sjkoshy * 4373147191Sjkoshy * We also need to atomically remove this process' 4374147191Sjkoshy * entry from our target process hash table, using 4375147191Sjkoshy * PMC_FLAG_REMOVE. 4376147191Sjkoshy */ 4377147191Sjkoshy PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 4378147191Sjkoshy p->p_comm); 4379147191Sjkoshy 4380147191Sjkoshy critical_enter(); /* no preemption */ 4381147191Sjkoshy 4382147191Sjkoshy cpu = curthread->td_oncpu; 4383147191Sjkoshy 4384147191Sjkoshy if ((pp = pmc_find_process_descriptor(p, 4385147191Sjkoshy PMC_FLAG_REMOVE)) != NULL) { 4386147191Sjkoshy 4387147191Sjkoshy PMCDBG(PRC,EXT,2, 4388147191Sjkoshy "process-exit proc=%p pmc-process=%p", p, pp); 4389147191Sjkoshy 4390147191Sjkoshy /* 4391147191Sjkoshy * The exiting process could the target of 4392147191Sjkoshy * some PMCs which will be running on 4393147191Sjkoshy * currently executing CPU. 4394147191Sjkoshy * 4395147191Sjkoshy * We need to turn these PMCs off like we 4396147191Sjkoshy * would do at context switch OUT time. 4397147191Sjkoshy */ 4398147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) { 4399147191Sjkoshy 4400147191Sjkoshy /* 4401147191Sjkoshy * Pick up the pmc pointer from hardware 4402147191Sjkoshy * state similar to the CSW_OUT code. 4403147191Sjkoshy */ 4404147191Sjkoshy pm = NULL; 4405147191Sjkoshy 4406184802Sjkoshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 4407184802Sjkoshy 4408184802Sjkoshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 4409184802Sjkoshy 4410147191Sjkoshy PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 4411147191Sjkoshy 4412147191Sjkoshy if (pm == NULL || 4413147191Sjkoshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 4414147191Sjkoshy continue; 4415147191Sjkoshy 4416147191Sjkoshy PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 4417147191Sjkoshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 4418147191Sjkoshy pm, pm->pm_state); 4419147191Sjkoshy 4420147191Sjkoshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 4421147191Sjkoshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 4422147191Sjkoshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 4423147191Sjkoshy 4424147191Sjkoshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 4425147191Sjkoshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 4426147191Sjkoshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 4427147191Sjkoshy 4428184802Sjkoshy (void) pcd->pcd_stop_pmc(cpu, adjri); 4429147191Sjkoshy 4430147191Sjkoshy KASSERT(pm->pm_runcount > 0, 4431147191Sjkoshy ("[pmc,%d] bad runcount ri %d rc %d", 4432147191Sjkoshy __LINE__, ri, pm->pm_runcount)); 4433147191Sjkoshy 4434147867Sjkoshy /* Stop hardware only if it is actually running */ 4435147191Sjkoshy if (pm->pm_state == PMC_STATE_RUNNING && 4436147867Sjkoshy pm->pm_stalled == 0) { 4437184802Sjkoshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 4438147191Sjkoshy tmp = newvalue - 4439147191Sjkoshy PMC_PCPU_SAVED(cpu,ri); 4440147191Sjkoshy 4441147191Sjkoshy mtx_pool_lock_spin(pmc_mtxpool, pm); 4442147191Sjkoshy pm->pm_gv.pm_savedvalue += tmp; 4443147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval += tmp; 4444147191Sjkoshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 4445147191Sjkoshy } 4446147191Sjkoshy 4447208861Sfabient atomic_subtract_rel_int(&pm->pm_runcount,1); 4448147191Sjkoshy 4449147191Sjkoshy KASSERT((int) pm->pm_runcount >= 0, 4450147191Sjkoshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 4451147191Sjkoshy 4452184802Sjkoshy (void) pcd->pcd_config_pmc(cpu, adjri, NULL); 4453147191Sjkoshy } 4454147191Sjkoshy 4455147191Sjkoshy /* 4456147191Sjkoshy * Inform the MD layer of this pseudo "context switch 4457147191Sjkoshy * out" 4458147191Sjkoshy */ 4459147191Sjkoshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 4460147191Sjkoshy 4461147191Sjkoshy critical_exit(); /* ok to be pre-empted now */ 4462147191Sjkoshy 4463147191Sjkoshy /* 4464147191Sjkoshy * Unlink this process from the PMCs that are 4465147191Sjkoshy * targetting it. This will send a signal to 4466147191Sjkoshy * all PMC owner's whose PMCs are orphaned. 4467147191Sjkoshy * 4468147191Sjkoshy * Log PMC value at exit time if requested. 4469147191Sjkoshy */ 4470147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4471147191Sjkoshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 4472147867Sjkoshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 4473147867Sjkoshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 4474147191Sjkoshy pmclog_process_procexit(pm, pp); 4475147191Sjkoshy pmc_unlink_target_process(pm, pp); 4476147191Sjkoshy } 4477184205Sdes free(pp, M_PMC); 4478147191Sjkoshy 4479147191Sjkoshy } else 4480147191Sjkoshy critical_exit(); /* pp == NULL */ 4481147191Sjkoshy 4482147191Sjkoshy 4483147191Sjkoshy /* 4484147191Sjkoshy * If the process owned PMCs, free them up and free up 4485147191Sjkoshy * memory. 4486147191Sjkoshy */ 4487147191Sjkoshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 4488147191Sjkoshy pmc_remove_owner(po); 4489147191Sjkoshy pmc_destroy_owner_descriptor(po); 4490145256Sjkoshy } 4491147191Sjkoshy 4492147191Sjkoshy sx_xunlock(&pmc_sx); 4493145256Sjkoshy} 4494145256Sjkoshy 4495145256Sjkoshy/* 4496145256Sjkoshy * Handle a process fork. 4497145256Sjkoshy * 4498145256Sjkoshy * If the parent process 'p1' is under HWPMC monitoring, then copy 4499145256Sjkoshy * over any attached PMCs that have 'do_descendants' semantics. 4500145256Sjkoshy */ 4501145256Sjkoshy 4502145256Sjkoshystatic void 4503147191Sjkoshypmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 4504145256Sjkoshy int flags) 4505145256Sjkoshy{ 4506145256Sjkoshy int is_using_hwpmcs; 4507147191Sjkoshy unsigned int ri; 4508147191Sjkoshy uint32_t do_descendants; 4509147191Sjkoshy struct pmc *pm; 4510147191Sjkoshy struct pmc_owner *po; 4511147191Sjkoshy struct pmc_process *ppnew, *ppold; 4512145256Sjkoshy 4513145256Sjkoshy (void) flags; /* unused parameter */ 4514145256Sjkoshy 4515145256Sjkoshy PROC_LOCK(p1); 4516145256Sjkoshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 4517145256Sjkoshy PROC_UNLOCK(p1); 4518145256Sjkoshy 4519147191Sjkoshy /* 4520147191Sjkoshy * If there are system-wide sampling PMCs active, we need to 4521147191Sjkoshy * log all fork events to their owner's logs. 4522147191Sjkoshy */ 4523147191Sjkoshy 4524147191Sjkoshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4525147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4526147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 4527147191Sjkoshy 4528147191Sjkoshy if (!is_using_hwpmcs) 4529147191Sjkoshy return; 4530147191Sjkoshy 4531147191Sjkoshy PMC_GET_SX_XLOCK(); 4532147191Sjkoshy PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 4533147191Sjkoshy p1->p_pid, p1->p_comm, newproc); 4534147191Sjkoshy 4535147191Sjkoshy /* 4536147191Sjkoshy * If the parent process (curthread->td_proc) is a 4537147191Sjkoshy * target of any PMCs, look for PMCs that are to be 4538147191Sjkoshy * inherited, and link these into the new process 4539147191Sjkoshy * descriptor. 4540147191Sjkoshy */ 4541147191Sjkoshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 4542147191Sjkoshy PMC_FLAG_NONE)) == NULL) 4543147191Sjkoshy goto done; /* nothing to do */ 4544147191Sjkoshy 4545147191Sjkoshy do_descendants = 0; 4546147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4547147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 4548147191Sjkoshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 4549147191Sjkoshy if (do_descendants == 0) /* nothing to do */ 4550147191Sjkoshy goto done; 4551147191Sjkoshy 4552147191Sjkoshy /* allocate a descriptor for the new process */ 4553147191Sjkoshy if ((ppnew = pmc_find_process_descriptor(newproc, 4554147191Sjkoshy PMC_FLAG_ALLOCATE)) == NULL) 4555147191Sjkoshy goto done; 4556147191Sjkoshy 4557147191Sjkoshy /* 4558147191Sjkoshy * Run through all PMCs that were targeting the old process 4559147191Sjkoshy * and which specified F_DESCENDANTS and attach them to the 4560147191Sjkoshy * new process. 4561147191Sjkoshy * 4562147191Sjkoshy * Log the fork event to all owners of PMCs attached to this 4563147191Sjkoshy * process, if not already logged. 4564147191Sjkoshy */ 4565147191Sjkoshy for (ri = 0; ri < md->pmd_npmc; ri++) 4566147191Sjkoshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 4567147191Sjkoshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 4568147191Sjkoshy pmc_link_target_process(pm, ppnew); 4569147191Sjkoshy po = pm->pm_owner; 4570147191Sjkoshy if (po->po_sscount == 0 && 4571147191Sjkoshy po->po_flags & PMC_PO_OWNS_LOGFILE) 4572147191Sjkoshy pmclog_process_procfork(po, p1->p_pid, 4573147191Sjkoshy newproc->p_pid); 4574147191Sjkoshy } 4575147191Sjkoshy 4576147191Sjkoshy /* 4577147191Sjkoshy * Now mark the new process as being tracked by this driver. 4578147191Sjkoshy */ 4579147191Sjkoshy PROC_LOCK(newproc); 4580147191Sjkoshy newproc->p_flag |= P_HWPMC; 4581147191Sjkoshy PROC_UNLOCK(newproc); 4582147191Sjkoshy 4583147191Sjkoshy done: 4584147191Sjkoshy sx_xunlock(&pmc_sx); 4585145256Sjkoshy} 4586145256Sjkoshy 4587254813Smarkjstatic void 4588254813Smarkjpmc_kld_load(void *arg __unused, linker_file_t lf) 4589254813Smarkj{ 4590254813Smarkj struct pmc_owner *po; 4591145256Sjkoshy 4592254813Smarkj sx_slock(&pmc_sx); 4593254813Smarkj 4594254813Smarkj /* 4595254813Smarkj * Notify owners of system sampling PMCs about KLD operations. 4596254813Smarkj */ 4597254813Smarkj LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4598254813Smarkj if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4599254813Smarkj pmclog_process_map_in(po, (pid_t) -1, 4600254813Smarkj (uintfptr_t) lf->address, lf->filename); 4601254813Smarkj 4602254813Smarkj /* 4603254813Smarkj * TODO: Notify owners of (all) process-sampling PMCs too. 4604254813Smarkj */ 4605254813Smarkj 4606254813Smarkj sx_sunlock(&pmc_sx); 4607254813Smarkj} 4608254813Smarkj 4609254813Smarkjstatic void 4610254813Smarkjpmc_kld_unload(void *arg __unused, const char *filename __unused, 4611254813Smarkj caddr_t address, size_t size) 4612254813Smarkj{ 4613254813Smarkj struct pmc_owner *po; 4614254813Smarkj 4615254813Smarkj sx_slock(&pmc_sx); 4616254813Smarkj 4617254813Smarkj LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4618254813Smarkj if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4619254813Smarkj pmclog_process_map_out(po, (pid_t) -1, 4620254813Smarkj (uintfptr_t) address, (uintfptr_t) address + size); 4621254813Smarkj 4622254813Smarkj /* 4623254813Smarkj * TODO: Notify owners of process-sampling PMCs. 4624254813Smarkj */ 4625254813Smarkj 4626254813Smarkj sx_sunlock(&pmc_sx); 4627254813Smarkj} 4628254813Smarkj 4629145256Sjkoshy/* 4630145256Sjkoshy * initialization 4631145256Sjkoshy */ 4632145256Sjkoshy 4633145256Sjkoshystatic const char *pmc_name_of_pmcclass[] = { 4634145256Sjkoshy#undef __PMC_CLASS 4635145256Sjkoshy#define __PMC_CLASS(N) #N , 4636145256Sjkoshy __PMC_CLASSES() 4637145256Sjkoshy}; 4638145256Sjkoshy 4639233628Sfabient/* 4640233628Sfabient * Base class initializer: allocate structure and set default classes. 4641233628Sfabient */ 4642233628Sfabientstruct pmc_mdep * 4643233628Sfabientpmc_mdep_alloc(int nclasses) 4644233628Sfabient{ 4645233628Sfabient struct pmc_mdep *md; 4646233628Sfabient int n; 4647233628Sfabient 4648233628Sfabient /* SOFT + md classes */ 4649233628Sfabient n = 1 + nclasses; 4650233628Sfabient md = malloc(sizeof(struct pmc_mdep) + n * 4651233628Sfabient sizeof(struct pmc_classdep), M_PMC, M_WAITOK|M_ZERO); 4652250105Sdavide md->pmd_nclass = n; 4653233628Sfabient 4654250105Sdavide /* Add base class. */ 4655250105Sdavide pmc_soft_initialize(md); 4656233628Sfabient return md; 4657233628Sfabient} 4658233628Sfabient 4659233628Sfabientvoid 4660233628Sfabientpmc_mdep_free(struct pmc_mdep *md) 4661233628Sfabient{ 4662233628Sfabient pmc_soft_finalize(md); 4663233628Sfabient free(md, M_PMC); 4664233628Sfabient} 4665233628Sfabient 4666145256Sjkoshystatic int 4667233628Sfabientgeneric_switch_in(struct pmc_cpu *pc, struct pmc_process *pp) 4668233628Sfabient{ 4669233628Sfabient (void) pc; (void) pp; 4670233628Sfabient 4671233628Sfabient return (0); 4672233628Sfabient} 4673233628Sfabient 4674233628Sfabientstatic int 4675233628Sfabientgeneric_switch_out(struct pmc_cpu *pc, struct pmc_process *pp) 4676233628Sfabient{ 4677233628Sfabient (void) pc; (void) pp; 4678233628Sfabient 4679233628Sfabient return (0); 4680233628Sfabient} 4681233628Sfabient 4682233628Sfabientstatic struct pmc_mdep * 4683233628Sfabientpmc_generic_cpu_initialize(void) 4684233628Sfabient{ 4685233628Sfabient struct pmc_mdep *md; 4686233628Sfabient 4687233628Sfabient md = pmc_mdep_alloc(0); 4688233628Sfabient 4689233628Sfabient md->pmd_cputype = PMC_CPU_GENERIC; 4690233628Sfabient 4691233628Sfabient md->pmd_pcpu_init = NULL; 4692233628Sfabient md->pmd_pcpu_fini = NULL; 4693233628Sfabient md->pmd_switch_in = generic_switch_in; 4694233628Sfabient md->pmd_switch_out = generic_switch_out; 4695233628Sfabient 4696233628Sfabient return (md); 4697233628Sfabient} 4698233628Sfabient 4699233628Sfabientstatic void 4700233628Sfabientpmc_generic_cpu_finalize(struct pmc_mdep *md) 4701233628Sfabient{ 4702233628Sfabient (void) md; 4703233628Sfabient} 4704233628Sfabient 4705233628Sfabient 4706233628Sfabientstatic int 4707145256Sjkoshypmc_initialize(void) 4708145256Sjkoshy{ 4709184802Sjkoshy int c, cpu, error, n, ri; 4710183266Sjkoshy unsigned int maxcpu; 4711145256Sjkoshy struct pmc_binding pb; 4712174395Sjkoshy struct pmc_sample *ps; 4713184802Sjkoshy struct pmc_classdep *pcd; 4714147191Sjkoshy struct pmc_samplebuffer *sb; 4715145256Sjkoshy 4716145256Sjkoshy md = NULL; 4717145256Sjkoshy error = 0; 4718145256Sjkoshy 4719153110Sru#ifdef DEBUG 4720145256Sjkoshy /* parse debug flags first */ 4721145256Sjkoshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 4722145256Sjkoshy pmc_debugstr, sizeof(pmc_debugstr))) 4723145256Sjkoshy pmc_debugflags_parse(pmc_debugstr, 4724145256Sjkoshy pmc_debugstr+strlen(pmc_debugstr)); 4725145256Sjkoshy#endif 4726145256Sjkoshy 4727145256Sjkoshy PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 4728145256Sjkoshy 4729148562Sjkoshy /* check kernel version */ 4730148562Sjkoshy if (pmc_kernel_version != PMC_VERSION) { 4731148562Sjkoshy if (pmc_kernel_version == 0) 4732148562Sjkoshy printf("hwpmc: this kernel has not been compiled with " 4733148562Sjkoshy "'options HWPMC_HOOKS'.\n"); 4734148562Sjkoshy else 4735148562Sjkoshy printf("hwpmc: kernel version (0x%x) does not match " 4736148562Sjkoshy "module version (0x%x).\n", pmc_kernel_version, 4737148562Sjkoshy PMC_VERSION); 4738148562Sjkoshy return EPROGMISMATCH; 4739148562Sjkoshy } 4740148562Sjkoshy 4741145256Sjkoshy /* 4742145256Sjkoshy * check sysctl parameters 4743145256Sjkoshy */ 4744145256Sjkoshy 4745145256Sjkoshy if (pmc_hashsize <= 0) { 4746174395Sjkoshy (void) printf("hwpmc: tunable \"hashsize\"=%d must be " 4747174395Sjkoshy "greater than zero.\n", pmc_hashsize); 4748145256Sjkoshy pmc_hashsize = PMC_HASH_SIZE; 4749145256Sjkoshy } 4750145256Sjkoshy 4751147191Sjkoshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 4752174395Sjkoshy (void) printf("hwpmc: tunable \"nsamples\"=%d out of " 4753174395Sjkoshy "range.\n", pmc_nsamples); 4754147191Sjkoshy pmc_nsamples = PMC_NSAMPLES; 4755147191Sjkoshy } 4756145256Sjkoshy 4757174395Sjkoshy if (pmc_callchaindepth <= 0 || 4758174395Sjkoshy pmc_callchaindepth > PMC_CALLCHAIN_DEPTH_MAX) { 4759174395Sjkoshy (void) printf("hwpmc: tunable \"callchaindepth\"=%d out of " 4760174395Sjkoshy "range.\n", pmc_callchaindepth); 4761174395Sjkoshy pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 4762174395Sjkoshy } 4763174395Sjkoshy 4764147191Sjkoshy md = pmc_md_initialize(); 4765233628Sfabient if (md == NULL) { 4766233628Sfabient /* Default to generic CPU. */ 4767233628Sfabient md = pmc_generic_cpu_initialize(); 4768233628Sfabient if (md == NULL) 4769233628Sfabient return (ENOSYS); 4770233628Sfabient } 4771147191Sjkoshy 4772184802Sjkoshy KASSERT(md->pmd_nclass >= 1 && md->pmd_npmc >= 1, 4773184802Sjkoshy ("[pmc,%d] no classes or pmcs", __LINE__)); 4774184802Sjkoshy 4775184802Sjkoshy /* Compute the map from row-indices to classdep pointers. */ 4776184802Sjkoshy pmc_rowindex_to_classdep = malloc(sizeof(struct pmc_classdep *) * 4777184802Sjkoshy md->pmd_npmc, M_PMC, M_WAITOK|M_ZERO); 4778184802Sjkoshy 4779184802Sjkoshy for (n = 0; n < md->pmd_npmc; n++) 4780184802Sjkoshy pmc_rowindex_to_classdep[n] = NULL; 4781184802Sjkoshy for (ri = c = 0; c < md->pmd_nclass; c++) { 4782184802Sjkoshy pcd = &md->pmd_classdep[c]; 4783184802Sjkoshy for (n = 0; n < pcd->pcd_num; n++, ri++) 4784184802Sjkoshy pmc_rowindex_to_classdep[ri] = pcd; 4785184802Sjkoshy } 4786184802Sjkoshy 4787184802Sjkoshy KASSERT(ri == md->pmd_npmc, 4788184802Sjkoshy ("[pmc,%d] npmc miscomputed: ri=%d, md->npmc=%d", __LINE__, 4789184802Sjkoshy ri, md->pmd_npmc)); 4790184802Sjkoshy 4791183266Sjkoshy maxcpu = pmc_cpu_max(); 4792183266Sjkoshy 4793145256Sjkoshy /* allocate space for the per-cpu array */ 4794184802Sjkoshy pmc_pcpu = malloc(maxcpu * sizeof(struct pmc_cpu *), M_PMC, 4795184802Sjkoshy M_WAITOK|M_ZERO); 4796145256Sjkoshy 4797145256Sjkoshy /* per-cpu 'saved values' for managing process-mode PMCs */ 4798184214Sdes pmc_pcpu_saved = malloc(sizeof(pmc_value_t) * maxcpu * md->pmd_npmc, 4799184214Sdes M_PMC, M_WAITOK); 4800145256Sjkoshy 4801183266Sjkoshy /* Perform CPU-dependent initialization. */ 4802145256Sjkoshy pmc_save_cpu_binding(&pb); 4803184802Sjkoshy error = 0; 4804184802Sjkoshy for (cpu = 0; error == 0 && cpu < maxcpu; cpu++) { 4805183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4806145256Sjkoshy continue; 4807145256Sjkoshy pmc_select_cpu(cpu); 4808184802Sjkoshy pmc_pcpu[cpu] = malloc(sizeof(struct pmc_cpu) + 4809184802Sjkoshy md->pmd_npmc * sizeof(struct pmc_hw *), M_PMC, 4810184802Sjkoshy M_WAITOK|M_ZERO); 4811184802Sjkoshy if (md->pmd_pcpu_init) 4812185363Sjkoshy error = md->pmd_pcpu_init(md, cpu); 4813184802Sjkoshy for (n = 0; error == 0 && n < md->pmd_nclass; n++) 4814184802Sjkoshy error = md->pmd_classdep[n].pcd_pcpu_init(md, cpu); 4815145256Sjkoshy } 4816145256Sjkoshy pmc_restore_cpu_binding(&pb); 4817145256Sjkoshy 4818184802Sjkoshy if (error) 4819184802Sjkoshy return (error); 4820145256Sjkoshy 4821147191Sjkoshy /* allocate space for the sample array */ 4822183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 4823183266Sjkoshy if (!pmc_cpu_is_active(cpu)) 4824147191Sjkoshy continue; 4825184802Sjkoshy 4826184214Sdes sb = malloc(sizeof(struct pmc_samplebuffer) + 4827147191Sjkoshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4828147191Sjkoshy M_WAITOK|M_ZERO); 4829147191Sjkoshy sb->ps_read = sb->ps_write = sb->ps_samples; 4830153735Sjkoshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4831184802Sjkoshy 4832147191Sjkoshy KASSERT(pmc_pcpu[cpu] != NULL, 4833147191Sjkoshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4834147191Sjkoshy 4835184802Sjkoshy sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples * 4836184802Sjkoshy sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO); 4837174395Sjkoshy 4838174395Sjkoshy for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4839174395Sjkoshy ps->ps_pc = sb->ps_callchains + 4840174395Sjkoshy (n * pmc_callchaindepth); 4841174395Sjkoshy 4842233628Sfabient pmc_pcpu[cpu]->pc_sb[PMC_HR] = sb; 4843233628Sfabient 4844233628Sfabient sb = malloc(sizeof(struct pmc_samplebuffer) + 4845233628Sfabient pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4846233628Sfabient M_WAITOK|M_ZERO); 4847233628Sfabient sb->ps_read = sb->ps_write = sb->ps_samples; 4848233628Sfabient sb->ps_fence = sb->ps_samples + pmc_nsamples; 4849233628Sfabient 4850233628Sfabient KASSERT(pmc_pcpu[cpu] != NULL, 4851233628Sfabient ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4852233628Sfabient 4853233628Sfabient sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples * 4854233628Sfabient sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO); 4855233628Sfabient 4856233628Sfabient for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 4857233628Sfabient ps->ps_pc = sb->ps_callchains + 4858233628Sfabient (n * pmc_callchaindepth); 4859233628Sfabient 4860233628Sfabient pmc_pcpu[cpu]->pc_sb[PMC_SR] = sb; 4861147191Sjkoshy } 4862147191Sjkoshy 4863145256Sjkoshy /* allocate space for the row disposition array */ 4864145256Sjkoshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 4865145256Sjkoshy M_PMC, M_WAITOK|M_ZERO); 4866145256Sjkoshy 4867145256Sjkoshy /* mark all PMCs as available */ 4868145256Sjkoshy for (n = 0; n < (int) md->pmd_npmc; n++) 4869145256Sjkoshy PMC_MARK_ROW_FREE(n); 4870145256Sjkoshy 4871145256Sjkoshy /* allocate thread hash tables */ 4872145256Sjkoshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 4873145256Sjkoshy &pmc_ownerhashmask); 4874145256Sjkoshy 4875145256Sjkoshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 4876145256Sjkoshy &pmc_processhashmask); 4877168856Sjkoshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc-leaf", 4878168856Sjkoshy MTX_SPIN); 4879145256Sjkoshy 4880147191Sjkoshy LIST_INIT(&pmc_ss_owners); 4881147191Sjkoshy pmc_ss_count = 0; 4882147191Sjkoshy 4883145256Sjkoshy /* allocate a pool of spin mutexes */ 4884168856Sjkoshy pmc_mtxpool = mtx_pool_create("pmc-leaf", pmc_mtxpool_size, 4885168856Sjkoshy MTX_SPIN); 4886145256Sjkoshy 4887145256Sjkoshy PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4888145256Sjkoshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4889145256Sjkoshy pmc_processhash, pmc_processhashmask); 4890145256Sjkoshy 4891145256Sjkoshy /* register process {exit,fork,exec} handlers */ 4892145256Sjkoshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4893145256Sjkoshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4894145256Sjkoshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4895145256Sjkoshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4896145256Sjkoshy 4897254813Smarkj /* register kld event handlers */ 4898254813Smarkj pmc_kld_load_tag = EVENTHANDLER_REGISTER(kld_load, pmc_kld_load, 4899254813Smarkj NULL, EVENTHANDLER_PRI_ANY); 4900254813Smarkj pmc_kld_unload_tag = EVENTHANDLER_REGISTER(kld_unload, pmc_kld_unload, 4901254813Smarkj NULL, EVENTHANDLER_PRI_ANY); 4902254813Smarkj 4903147191Sjkoshy /* initialize logging */ 4904147191Sjkoshy pmclog_initialize(); 4905147191Sjkoshy 4906145256Sjkoshy /* set hook functions */ 4907145256Sjkoshy pmc_intr = md->pmd_intr; 4908145256Sjkoshy pmc_hook = pmc_hook_handler; 4909145256Sjkoshy 4910145256Sjkoshy if (error == 0) { 4911145256Sjkoshy printf(PMC_MODULE_NAME ":"); 4912149373Sjkoshy for (n = 0; n < (int) md->pmd_nclass; n++) { 4913184802Sjkoshy pcd = &md->pmd_classdep[n]; 4914184997Sjkoshy printf(" %s/%d/%d/0x%b", 4915184802Sjkoshy pmc_name_of_pmcclass[pcd->pcd_class], 4916184802Sjkoshy pcd->pcd_num, 4917184997Sjkoshy pcd->pcd_width, 4918184802Sjkoshy pcd->pcd_caps, 4919149373Sjkoshy "\20" 4920149373Sjkoshy "\1INT\2USR\3SYS\4EDG\5THR" 4921149373Sjkoshy "\6REA\7WRI\10INV\11QUA\12PRC" 4922149373Sjkoshy "\13TAG\14CSC"); 4923149373Sjkoshy } 4924145256Sjkoshy printf("\n"); 4925145256Sjkoshy } 4926145256Sjkoshy 4927184802Sjkoshy return (error); 4928145256Sjkoshy} 4929145256Sjkoshy 4930145256Sjkoshy/* prepare to be unloaded */ 4931145256Sjkoshystatic void 4932145256Sjkoshypmc_cleanup(void) 4933145256Sjkoshy{ 4934184802Sjkoshy int c, cpu; 4935183266Sjkoshy unsigned int maxcpu; 4936145256Sjkoshy struct pmc_ownerhash *ph; 4937145256Sjkoshy struct pmc_owner *po, *tmp; 4938145256Sjkoshy struct pmc_binding pb; 4939153110Sru#ifdef DEBUG 4940145256Sjkoshy struct pmc_processhash *prh; 4941145256Sjkoshy#endif 4942145256Sjkoshy 4943145256Sjkoshy PMCDBG(MOD,INI,0, "%s", "cleanup"); 4944145256Sjkoshy 4945147191Sjkoshy /* switch off sampling */ 4946222813Sattilio CPU_ZERO(&pmc_cpumask); 4947147191Sjkoshy pmc_intr = NULL; 4948145256Sjkoshy 4949145256Sjkoshy sx_xlock(&pmc_sx); 4950145256Sjkoshy if (pmc_hook == NULL) { /* being unloaded already */ 4951145256Sjkoshy sx_xunlock(&pmc_sx); 4952145256Sjkoshy return; 4953145256Sjkoshy } 4954145256Sjkoshy 4955145256Sjkoshy pmc_hook = NULL; /* prevent new threads from entering module */ 4956145256Sjkoshy 4957145256Sjkoshy /* deregister event handlers */ 4958145256Sjkoshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 4959145256Sjkoshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 4960254813Smarkj EVENTHANDLER_DEREGISTER(kld_load, pmc_kld_load_tag); 4961254813Smarkj EVENTHANDLER_DEREGISTER(kld_unload, pmc_kld_unload_tag); 4962145256Sjkoshy 4963145256Sjkoshy /* send SIGBUS to all owner threads, free up allocations */ 4964145256Sjkoshy if (pmc_ownerhash) 4965145256Sjkoshy for (ph = pmc_ownerhash; 4966145256Sjkoshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 4967145256Sjkoshy ph++) { 4968145256Sjkoshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 4969145256Sjkoshy pmc_remove_owner(po); 4970145256Sjkoshy 4971145256Sjkoshy /* send SIGBUS to owner processes */ 4972145256Sjkoshy PMCDBG(MOD,INI,2, "cleanup signal proc=%p " 4973145256Sjkoshy "(%d, %s)", po->po_owner, 4974145256Sjkoshy po->po_owner->p_pid, 4975145256Sjkoshy po->po_owner->p_comm); 4976145256Sjkoshy 4977145256Sjkoshy PROC_LOCK(po->po_owner); 4978225617Skmacy kern_psignal(po->po_owner, SIGBUS); 4979145256Sjkoshy PROC_UNLOCK(po->po_owner); 4980147191Sjkoshy 4981147191Sjkoshy pmc_destroy_owner_descriptor(po); 4982145256Sjkoshy } 4983145256Sjkoshy } 4984145256Sjkoshy 4985145256Sjkoshy /* reclaim allocated data structures */ 4986145256Sjkoshy if (pmc_mtxpool) 4987145256Sjkoshy mtx_pool_destroy(&pmc_mtxpool); 4988145256Sjkoshy 4989145256Sjkoshy mtx_destroy(&pmc_processhash_mtx); 4990145256Sjkoshy if (pmc_processhash) { 4991153110Sru#ifdef DEBUG 4992145256Sjkoshy struct pmc_process *pp; 4993145256Sjkoshy 4994145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy process hash"); 4995145256Sjkoshy for (prh = pmc_processhash; 4996145256Sjkoshy prh <= &pmc_processhash[pmc_processhashmask]; 4997145256Sjkoshy prh++) 4998145256Sjkoshy LIST_FOREACH(pp, prh, pp_next) 4999145256Sjkoshy PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 5000145256Sjkoshy#endif 5001145256Sjkoshy 5002145256Sjkoshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 5003145256Sjkoshy pmc_processhash = NULL; 5004145256Sjkoshy } 5005145256Sjkoshy 5006145256Sjkoshy if (pmc_ownerhash) { 5007145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "destroy owner hash"); 5008145256Sjkoshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 5009145256Sjkoshy pmc_ownerhash = NULL; 5010145256Sjkoshy } 5011145256Sjkoshy 5012147191Sjkoshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 5013147191Sjkoshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 5014147191Sjkoshy KASSERT(pmc_ss_count == 0, 5015147191Sjkoshy ("[pmc,%d] Global SS count not empty", __LINE__)); 5016147191Sjkoshy 5017184802Sjkoshy /* do processor and pmc-class dependent cleanup */ 5018183266Sjkoshy maxcpu = pmc_cpu_max(); 5019153735Sjkoshy 5020145256Sjkoshy PMCDBG(MOD,INI,3, "%s", "md cleanup"); 5021145256Sjkoshy if (md) { 5022145256Sjkoshy pmc_save_cpu_binding(&pb); 5023183266Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 5024145256Sjkoshy PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 5025145256Sjkoshy cpu, pmc_pcpu[cpu]); 5026183266Sjkoshy if (!pmc_cpu_is_active(cpu) || pmc_pcpu[cpu] == NULL) 5027145256Sjkoshy continue; 5028145256Sjkoshy pmc_select_cpu(cpu); 5029184802Sjkoshy for (c = 0; c < md->pmd_nclass; c++) 5030184802Sjkoshy md->pmd_classdep[c].pcd_pcpu_fini(md, cpu); 5031184802Sjkoshy if (md->pmd_pcpu_fini) 5032185363Sjkoshy md->pmd_pcpu_fini(md, cpu); 5033145256Sjkoshy } 5034184994Sjkoshy 5035233628Sfabient if (md->pmd_cputype == PMC_CPU_GENERIC) 5036233628Sfabient pmc_generic_cpu_finalize(md); 5037233628Sfabient else 5038233628Sfabient pmc_md_finalize(md); 5039184994Sjkoshy 5040233628Sfabient pmc_mdep_free(md); 5041145256Sjkoshy md = NULL; 5042145256Sjkoshy pmc_restore_cpu_binding(&pb); 5043145256Sjkoshy } 5044145256Sjkoshy 5045184802Sjkoshy /* Free per-cpu descriptors. */ 5046184802Sjkoshy for (cpu = 0; cpu < maxcpu; cpu++) { 5047184802Sjkoshy if (!pmc_cpu_is_active(cpu)) 5048184802Sjkoshy continue; 5049233628Sfabient KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_HR] != NULL, 5050233628Sfabient ("[pmc,%d] Null hw cpu sample buffer cpu=%d", __LINE__, 5051184802Sjkoshy cpu)); 5052233628Sfabient KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_SR] != NULL, 5053233628Sfabient ("[pmc,%d] Null sw cpu sample buffer cpu=%d", __LINE__, 5054233628Sfabient cpu)); 5055233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_HR]->ps_callchains, M_PMC); 5056233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_HR], M_PMC); 5057233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_SR]->ps_callchains, M_PMC); 5058233628Sfabient free(pmc_pcpu[cpu]->pc_sb[PMC_SR], M_PMC); 5059184802Sjkoshy free(pmc_pcpu[cpu], M_PMC); 5060184802Sjkoshy } 5061184802Sjkoshy 5062184205Sdes free(pmc_pcpu, M_PMC); 5063145256Sjkoshy pmc_pcpu = NULL; 5064145256Sjkoshy 5065184205Sdes free(pmc_pcpu_saved, M_PMC); 5066145256Sjkoshy pmc_pcpu_saved = NULL; 5067145256Sjkoshy 5068145256Sjkoshy if (pmc_pmcdisp) { 5069184205Sdes free(pmc_pmcdisp, M_PMC); 5070145256Sjkoshy pmc_pmcdisp = NULL; 5071145256Sjkoshy } 5072145256Sjkoshy 5073184802Sjkoshy if (pmc_rowindex_to_classdep) { 5074184802Sjkoshy free(pmc_rowindex_to_classdep, M_PMC); 5075184802Sjkoshy pmc_rowindex_to_classdep = NULL; 5076184802Sjkoshy } 5077184802Sjkoshy 5078147191Sjkoshy pmclog_shutdown(); 5079147191Sjkoshy 5080145256Sjkoshy sx_xunlock(&pmc_sx); /* we are done */ 5081145256Sjkoshy} 5082145256Sjkoshy 5083145256Sjkoshy/* 5084145256Sjkoshy * The function called at load/unload. 5085145256Sjkoshy */ 5086145256Sjkoshy 5087145256Sjkoshystatic int 5088145256Sjkoshyload (struct module *module __unused, int cmd, void *arg __unused) 5089145256Sjkoshy{ 5090145256Sjkoshy int error; 5091145256Sjkoshy 5092145256Sjkoshy error = 0; 5093145256Sjkoshy 5094145256Sjkoshy switch (cmd) { 5095145256Sjkoshy case MOD_LOAD : 5096145256Sjkoshy /* initialize the subsystem */ 5097145256Sjkoshy error = pmc_initialize(); 5098145256Sjkoshy if (error != 0) 5099145256Sjkoshy break; 5100183266Sjkoshy PMCDBG(MOD,INI,1, "syscall=%d maxcpu=%d", 5101183266Sjkoshy pmc_syscall_num, pmc_cpu_max()); 5102145256Sjkoshy break; 5103145256Sjkoshy 5104145256Sjkoshy 5105145256Sjkoshy case MOD_UNLOAD : 5106145256Sjkoshy case MOD_SHUTDOWN: 5107145256Sjkoshy pmc_cleanup(); 5108145256Sjkoshy PMCDBG(MOD,INI,1, "%s", "unloaded"); 5109145256Sjkoshy break; 5110145256Sjkoshy 5111145256Sjkoshy default : 5112145256Sjkoshy error = EINVAL; /* XXX should panic(9) */ 5113145256Sjkoshy break; 5114145256Sjkoshy } 5115145256Sjkoshy 5116145256Sjkoshy return error; 5117145256Sjkoshy} 5118145256Sjkoshy 5119145256Sjkoshy/* memory pool */ 5120145256SjkoshyMALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 5121